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Grade:12

1 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
9 years ago
Hii

For a) and f) Use Sin A + Sin B = 2 sin((A+B)/2)cos((A-B)/2)

For b) and c) Use CosA + Cos B = 2 cos((A+B)/2)cos((A-B)/2)


for d) Use Sin A - Sin B = 2sin((A-B)/2)cos((A+B)/2)

for e) Use CosA - Cos B = – 2sin((A+B)/2)sin((A-B)/2)


Thanks..

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