Question

Taking A=30, verify that
Cos2A= Cos²A-Sin²A

Answer 1

HELLO DEAR,

given that:-

A=30°

now put

This in the Equation we get,
cos2×30 = cos60°

cos60°=1/2

and

cos²30 - sin²30

=> (√3/2)² - (1/2)²

=>3/4-1/4

=>(3-1)/4

=>2/4


=>1/2

HENCE,


Cos2A= Cos²A-Sin²A

I HOPE ITS HELP YOU DEAR,
THANKS

Answer 2

Pls mark as a brainlist....
The solution is given in picture