Question

cos 90degree=1-2 sin square 45 degree =2

Answer 1

Solution :

I think it may be like this,

LHS = cos 90°+1+ 2 sin²45°

= 0 + 1 + 2×(1/√2)²

= 1 + 2/2

= 1 + 1

= 2

= RHS

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