If sinx+siny=a and cosx+cosy=2a what is the value of cos(x-y) ?
If sinx+siny=a and cosx+cosy=2a what is the value of cos(x-y) ?
Shushan , 9 Years ago
Grade 12
Trigonometry> If sinx+siny=a and cosx+cosy=2a what is t...
1 Answers
Bhumiti
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
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