[" 4."sin2B=2sin B" is true when "B" is "quad 1" point "],[" equal to "^(***)]

sin 2B = 2 sin B is true when B is equal to

Sin 2A= 2 sin A is true when A equals to

If sin2B=2sin B then angle B equal to

sin2A=2sin A is true when A=0o(b)300 (c) 45o(d)60o

(sin ^(2) A - sin ^(2) B)/( sin A cos A - sin B cos B) is equal to

sin^2A+sin^2(A-B)+2sinAcosBsin(B-A) is equal to

In a triangle sin^(4)A + sin^(4)B + sin^(4)C = sin^(2)B sin^(2)C + 2sin^(2) C sin^(2)A + 2sin^(2)A sin^(2)B , then its angle A is equal to-

In a triangle sin^(4)A + sin^(4)B + sin^(4)C = sin^(2)B sin^(2)C + 2sin^(2) C sin^(2)A + 2sin^(2)A sin^(2)B , then its angle A is equal to-