# Need a help with this problem prove identity sec(A+B) = cos(A-B)/cos^2A-sin^B?

• Need a help with this problem prove identity sec(A+B) = cos(A-B)/cos^2A-sin^B?

... i need help proving the following trig identity. i cant ... Prove: sin A + sin B = 2sin(A+B/2)cos ... I need to figure out how to prove that sec 2 x ...
Positive: 97 %
37965558 Bansal Classes Mathematics Study ... a. prove that b3 + a2c + ac2 = 3abc.x cos (A + B) ... where I & IB are identity functio ns on the sets A & B ...
Positive: 94 %

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... 2 cosA cosB = cos(A+B) + cos(A-B) ... acute angle, prove that ; - (p cosec 2 P - q sec 2 P) = ^/p2 ... 0. r=0 (l+log e 10 n ) Q.20 Prove the identity ...
Positive: 97 %
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