1.

If sina=cosa find the value of 2tana + cos*2a

Answer»

SinA = CosA
We know that Sin 45 = Cos 45
                So, A =45
So, 

2tan A + Cos2A = 2tan 45 + cos2 45
    = 2(1)  +(1/√2)2 = 2+1/2 = 4+1/2 = 5/2



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