Math, asked by pratu7398, 11 months ago

cos(pie/2-x)cos(pie/2-y)-sin(pie/2-x)sin(pie/2-y)=-cos(x+y)

Answers

Answered by sprao534

2

Answer:

= cos(π/2-x+π/2-y)

cos(π-(x+y))=-cos(x+y)

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