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Q.

If sin-12a1+a2+sin-12b1+b2=2 tan-1x, then x is equal to

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a

a-b1+ab

b

b1+ab

c

b1-ab

d

a+b1-ab

answer is D.

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Detailed Solution

sin-12a1+a2+sin-12b1+b2=2tan-1 x 2tan-1a+2tan-1b=2tan-1x tan-1a+tan-1b=tan-1x tan-1a+ b1-ab=tan-1x x=a+ b1-ab

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