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sinx +siny =-21/65 and cosx +cosy =-27/65 then value of cos(x+y/2

sinx +siny =-21/65 and cosx +cosy =-27/65 then value of cos(x+y/2

Grade:11

1 Answers

Arun
25763 Points
3 years ago
Dear Rahul
 
(sinx+siny)= – 21/65
cosx+cosy= – 27/65
Dividing this we get
tan(x + y/2)=21/27
cos (x+y/2)=27/sqrt (1170)

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