Question

How to calculate cos 15°

Answer 1

HOPE THIS WILL HELP

Answer 2

$\huge\bold{Solution}$

Cos15° = ?

Cos15° = Cos(45° - 30°)

Cos(a - b) = CosaCosb + SinaSinb

by following this...

=> Cos45°Cos30° + Sin45°Sin30°

=> (1/√2)×(√3/2) + (1/√2)×(1/2)

=> (√3/2√2) + (1/2√2)

=> (√3 + 1)/2√2

so,

Value of Cos15° = (√3+1)/2√2

Hope it helps u out✔✔