Question

plz help fast fast......

Answer 1

= sin( 90 - θ) cos (90 - θ)

= sinθ × cosθ

multipying and dividing with 2

⇒ 2/2(sinθ × cosθ)

⇒ 1/2(2 sinθ × cosθ)

⇒ 1/2(sin2θ)

⇒ 1/2(2tanθ/(1 + tan²θ))

⇒ tanθ/(1 + tan²θ)

• sin2θ = 2tanθ/1 + tan²θ