Question

prove this question ( Trigonometry )

Answer 1

it's easy this help u....

Answer 2

Answer:

Step-by-step explanation:

Please refer to attachment

Also forgot to add that (a + b )² = a² + b² +2ab

Also Here are some identities which You may find useful.

A}

1) sinθ÷cosθ = tanθ

2) sin²θ + cos²θ = 1

3) 1 + tan²θ = sec²θ

4) 1 = cot²θ = cosec²θ

B}

1) sin  ( 90 - θ ) = cos∅

2) cos ( 90 - θ ) = sin

3) sin ( 180 - θ ) = sinθ

4) cos ( 180 - θ ) = cosθ

C}

1) sin²θ = 1 - cos2θ ÷ 2

2) cos²θ = 1 + cos2θ ÷ 2

tan²θ = 1 - cos2θ ÷ 1 + cos2θ