Math, asked by prawa, 16 hours ago

Prove : (sinxcosy+cosxsiny)²+(cosxcosy-sinxsiny)²=1

Answers

Answered by ratha1908

1

Step-by-step explanation:

sinxcosy+cosxsiny)²+(cosxcosy-sinxsiny)²

={sin(x+y)}^2 + {cos(x+y)}^2

=1 (proved)

because

${ \sin }^{2} + { \cos}^{2} = 1$

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