Question

Evaluate (sinx+cosx)^2+(sinx-cosx) ^2

Answer 1

Answer:

this is very good and easy question

Answer 2

Answer:

=> (sinx+ cosx)^2+(sinx-cosx)^2

=> 2(sin^2x+cos^2x)

{ since,

(a+b)^2+(a-b)^2=2(a^2+b^2) }

=> 2 × 1. { sin^2x+cos^x=1}

=>2.

I hope it would help you

thank you