Math, asked by ramya07032001, 1 year ago

show that cos130cos40+sin130sin40=0

Answers

Answered by Anonymous

6

cos130cos40+sin130sin40
=cos(130-40)
[bcoz. cosAcosB+sinAsinB=cos(A-B)
=cos90
=0 =rhs
......hope it helps u.......

Answered by sonubasha23osvui3

5

cos130cos40+sin130sin40
=cos(130-40) [ cosAcosB+sinAsinB=cos(A-B)]
=cos90
=0
=rhs

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