Question

Cos 4x = 1-8sinx.cos^2x
prove it​

Answer 1

✳️Hi mate here is the answer ✳️

we know that,

Cos 2A= 1-2sin^2A

Sin 2A= 2 sinA.cosA

see above attachment ✔️

#_#_❤️❤️

Hope it helps you ☑️

Answer 2

${\huge{\underline{\blue{\mathcal{Answer:}}}}}$

Hope it helps you ❤️