Falling Behind in Studies? Join Our Performance Improvement Batch. Enroll For Free
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
if A+B+C=pi prove that a)cos(B-C)+cosA=2sinBsinC
its quite easy , in this type of questions generally substitute one angle in terms of otherput A= pi -(B+C) now cos A becomes cos(pi -(B+C)) = – cos(B+C)now u can easily get answer APPROVE IF USEFUL
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -