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Q.

If asinx=b cos x=2ctan x1-tan2x then a2-b22a2+b2=

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a

2c2

b

c2

c

4c2

d

8c2

answer is C.

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Detailed Solution

a cos x=b sin x=c2 tan x1-tan xtan x=baa sin x=2c ba1-b2a2a sin x=2abca2-b2aba2+b2=2abca2-b2a2-b2=2ca2+b2a2-b2a2+b2=4c2

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