Question

prove that...... please answer I have exam Tomorrow​

Answer 1

Hi !

Step 1 :- first of all use T-identity cos²x = 1+cos2x/2

step 2:- use T-identity cos(x+y)+cos(x-y)

step 3:- Finally after calculations ,we will get the answer . or LHS = RHS

Solution is in this given attachment .

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Hope it's helpful