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Q.

sin8xcos8x12sin2xcos2xdx=

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a

sin5x+cos5x6+c

b

sin34x3+c

c

-sin2x2+c

d

-sin4x+c

answer is C.

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Detailed Solution

I=Sin8x-cos8x1-2 Sin2x cos2xdx  =(Sin8x-cos8x)(Sin2x+cos2x)2-2Sin2x cos2xdx  =(Sin4x-cos4x)(Sin4x+cos4c)(Sin4x+cos4x)dx  =(Sin2x+cos2x)(Sin2x-cos2x)dx  =1.(-cos2x)dx  =-Sin 2x2×c

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