Q.

1+ cos2x + cos4x + cos6x=

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a

4cosx.cos2x.cos3x

b

0

c

4cosx.sin2x.cos3x

d

4sinx.sin2x.sin3x

answer is A.

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Detailed Solution

put x=0 L. H. S = 4           =4cosxcos2xcos3x
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1+ cos2x + cos4x + cos6x=