solve

Asked by  | 26th Apr, 2008, 02:04: PM

Expert Answer:

Solution:- If 3tanA = 3sinA,'then Sin A =0 or cosA  = 1

In both cases  A = 00

sin^2A - cos^2A = Sin^2 0 - cos^2 0 = 0 - 1 = -1.

Also Sin3A = SinA - 4sin^3A = sin3*30 = 3*sin 30 - 4*sin^3 30 = 3*1/2 - 4*1/8 = 3/2- 1/2 = 2/2 = 1

hence v erified.

Answered by  | 30th Jun, 2008, 08:09: PM

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