Question

cos square A minus sin square is equals to 2 cos square A minus one​

Answer 1

cos 35 join tectec-cpui-xpz

Answer 2

Answer:

Cos²A - Sin²A. = 2Cos²A-1

Cos²A-(1-Cos²A)= 2Cos²A-1

Cos²A-1 + Cos²A =2Cos²A-1

2Cos²A -1 = 2Cos²A-1

LHS=RHS

HENCE PROVED