Math, asked by judmentsurpriseMF, 4 months ago

cos2 25° + cos2 65º = 1

Answers

Answered by divyanagpal2004

4

L.H.S.

cos²25°+cos²65°

cos²25°+sin²(90°-65°)

[because cosθ=sin(90-θ)]

cos²25°+sin²25

1

[because cos²θ+sin²θ]

L.H.S.=R.H.S.

Hence proved

Answered by Susatwik

3

COS2 25°+COS2 65°=1 ITS TURE

THERE FOR THE LHS =RHS

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