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شائع علم المثلثات >

sin^2(x)=(tan(x))/2

الحلّ

sin^{2} (x) = \frac{tan ( x )}{2}

الحلّ

x = 2 πn, x = π + 2 πn, x = \frac{π}{4} + πn

درجات

x = 0^{\circ} + 36 0^{\circ} n, x = 18 0^{\circ} + 36 0^{\circ} n, x = 4 5^{\circ} + 18 0^{\circ} n

خطوات الحلّ

sin^{2} (x) = \frac{tan ( x )}{2}

من الطرفين

\frac{tan ( x )}{2}

اطرح

sin^{2} (x) - \frac{tan ( x )}{2} = 0

sin^{2} (x) - \frac{tan ( x )}{2}

بسّط:

\frac{2 sin ^{2} ( x ) - tan ( x )}{2}

sin^{2} (x) - \frac{tan ( x )}{2}

sin^{2} (x) = \frac{sin ^{2} ( x ) 2}{2}

:حوّل الأعداد لكسور

= \frac{sin ^{2} ( x ) \cdot 2}{2} - \frac{tan ( x )}{2}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{sin ^{2} ( x ) \cdot 2 - tan ( x )}{2}

\frac{2 sin ^{2} ( x ) - tan ( x )}{2} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

2 sin^{2} (x) - tan (x) = 0

sin, cos :

عبّر بواسطة

- tan (x) + 2 sin^{2} (x)

tan (x) = \frac{sin ( x )}{cos ( x )}

:Use the basic trigonometric identity

= - \frac{sin ( x )}{cos ( x )} + 2 sin^{2} (x)

- \frac{sin ( x )}{cos ( x )} + 2 sin^{2} (x)

بسّط:

\frac{- sin ( x ) + 2 sin ^{2} ( x ) cos ( x )}{cos ( x )}

- \frac{sin ( x )}{cos ( x )} + 2 sin^{2} (x)

2 sin^{2} (x) = \frac{2 sin ^{2} ( x ) cos ( x )}{cos ( x )}

:حوّل الأعداد لكسور

= - \frac{sin ( x )}{cos ( x )} + \frac{2 sin ^{2} ( x ) cos ( x )}{cos ( x )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{- sin ( x ) + 2 sin ^{2} ( x ) cos ( x )}{cos ( x )}

= \frac{- sin ( x ) + 2 sin ^{2} ( x ) cos ( x )}{cos ( x )}

\frac{- sin ( x ) + 2 cos ( x ) sin ^{2} ( x )}{cos ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

- sin (x) + 2 cos (x) sin^{2} (x) = 0

- sin (x) + 2 cos (x) sin^{2} (x)

حلل إلى عوامل:

sin (x) (- 1 + 2 sin (x) cos (x))

- sin (x) + 2 cos (x) sin^{2} (x)

a^{b + c} = a^{b} a^{c}

:فعّل قانون القوى

sin^{2} (x) cos (x) = sin (x) sin (x)

= - sin (x) + 2 sin (x) sin (x)

sin (x)

قم باخراج العامل المشترك

= sin (x) (- 1 + 2 sin (x) cos (x))

sin (x) (- 1 + 2 sin (x) cos (x)) = 0

حلّ كل جزء على حدة

sin (x) = 0 or - 1 + 2 sin (x) cos (x) = 0

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

sin (x) = 0 :

حلول عامّة لـ

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn

حلّ:

x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

- 1 + 2 sin (x) cos (x) = 0 : x = \frac{π}{4} + πn

- 1 + 2 sin (x) cos (x) = 0

Rewrite using trig identities

- 1 + 2 sin (x) cos (x)

2 sin (x) cos (x) = sin (2 x)

:فعّل متطابقة الزاوية المضاعفة

= - 1 + sin (2 x)

- 1 + sin (2 x) = 0

انقل

1

إلى الجانب الأيمن

- 1 + sin (2 x) = 0

للطرفين

1

أضف

- 1 + sin (2 x) + 1 = 0 + 1

بسّط

sin (2 x) = 1

sin (2 x) = 1

sin (2 x) = 1 :

حلول عامّة لـ

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

2 x = \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

حلّ:

x = \frac{π}{4} + πn

2 x = \frac{π}{2} + 2 πn

2

اقسم الطرفين على

2 x = \frac{π}{2} + 2 πn

2

اقسم الطرفين على

\frac{2 x}{2} = \frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

بسّط

\frac{2 x}{2} = \frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

\frac{2 x}{2}

بسّط:

x

\frac{2 x}{2}

\frac{2}{2} = 1 :

اقسم الأعداد

= x

\frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

بسّط:

\frac{π}{4} + πn

\frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

\frac{\frac{π}{2}}{2} = \frac{π}{4}

\frac{\frac{π}{2}}{2}

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

: استخدم ميزات الكسور التالية

= \frac{π}{2 \cdot 2}

2 \cdot 2 = 4 :

اضرب الأعداد

= \frac{π}{4}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

\frac{2}{2} = 1 :

اقسم الأعداد

= πn

= \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

وحّد الحلول

x = 2 πn, x = π + 2 πn, x = \frac{π}{4} + πn

رسم

أمثلة شائعة

((sin(x)+tan(x)))/(1+cos(x))=m*sec(x)

\frac{( sin ( x ) + tan ( x ) )}{1 + cos ( x )} = m \cdot sec (x)

2sin(2x)-2sin(x)=0

2 sin (2 x) - 2 sin (x) = 0

(sin(25))/5 =(sin(b))/8

\frac{sin ( 2 5 ^{\circ} )}{5} = \frac{sin ( b )}{8}

cos(x)-cos(3x)=-sqrt(2)sin(x)

cos (x) - cos (3 x) = - 2 sin (x)

sin(x)+sin(5x)=0

sin (x) + sin (5 x) = 0