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Grade: 12

                        

If sinx+siny=a and cosx+cosy=2a what is the value of cos(x-y) ?

4 years ago

Answers : (1)

Bhumiti
34 Points
							We know that cos(x-y) = cosx.cosy+sinx.siny... So just substitute the given values in the above equation...  We get cos(x-y)=2a+a =3a
						
4 years ago
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