Question

Prove that Cos20 (1 + tan²0) = 1​

Answer 1

Answer :

Hope this helps.

Answer 2

Step-by-step explanation:

Cos2Φ(1+tan2Φ) = 1

cos2Φ(1+sin2Φ/cos2Φ)=1. tan2Φ=sin2Φ/cos2Φ

then take LCM

so we get,

cos2Φ[cos2Φ+sin2Φ/cos2Φ]

cos2Φ[1/cos2Φ] cos2Φ+sin2Φ=1

cos2Φ gets cancelled with [1/cos2Φ]

and we get,

1 = 1

HENCE PROVED