CBSE Class 10 Answered
solve
Asked by | 26 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 | 30 Jun, 2008, 08:09: PM
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