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If (a+b)=0,than sin (a_b) can be reduced to

Posted by Shubham Singh 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Misha Yadav 6 years, 10 months ago

It should be cos(a+b)=0 then, cos(a+b)=cos90° =>a+b=90° =>a=90°-b Now sin(a-b) =sin(90-b-b) =sin(90-2b) =cos2b [as sin(90-x)=cosx]

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CBSE > Class 10 > Mathematics