1.

if a = cos 2B + cos 2A. , b= cos 2B - cos 2 A c= sin 2A+ sin 2B, d= sin = sin2A-sin2B Then which of the first is true. (A) a/b= cot(A+B) cot(A-B) (B) c/d= tan(A+B)/ tan(A-B) (C ) b/ c= tan(A-B) (D) none of these

Answer»

if a = cos 2B + cos 2A. , b= cos 2B - cos 2 A

c= sin 2A+ sin 2B, d= sin = sin2A-sin2B

Then which of the first is true.

(A) a/b= cot(A+B) cot(A-B)

(B) c/d= tan(A+B)/ tan(A-B)

(C ) b/ c= tan(A-B)

(D) none of these



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