Question

If sinx + siny = 0 and cosx +cosy =0 , find the value of cos( x - y )

Answer 1

Step-by-step explanation:

Given :

sinx + siny = 0

cosx +cosy =0

To Find :

value of cos( x - y )

Formula used:

cos( x - y ) = cosx cosy + sinx siny

sin²x +cos²x = 1

Sin²y+ cos²y= 1

Solution :

kindly check the attachment for the stepwise solution.

Answer = -1

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