CBSE Class 11-science Answered
SIR, PLEASE HELP ME.
Asked by | 28 Dec, 2009, 07:14: PM
Expert Answer
cos2(x+π/3) = (cos(x+π/3))2
=(cosx cosπ/3 - sinx sinπ/3)2
=((1/2)cosx - (3/2) sinx)2
Therefore,
cos2x + ((1/2)cosx- (3/2)sinx)2 + ((1/2)cosx + (3/2) sinx)2
= cos2x + (1/2)cos2x + (3/2)sin2x
= (3/2)(cos2x + sin2x)
= 3/2
Regards,
Team,
TopperLearning.
Answered by | 28 Dec, 2009, 11:05: PM
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