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Q.

If a⨍ tan x +b⨍ tcot x=x then ⨍ 1cotx=

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a

1a-b

b

sin2xa+b

c

sin2xa-b

d

sin2xb-a

answer is C.

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Detailed Solution

aftan x+b fcot x=x  (1) replace x by π2-x af (cot x)+b f(tan x)=π2-x  (2) (1)b-(2)a (b2-a2) f(cot x) = bx-aπ2-x b2-a2 f1(cot x)(-cosec2x) =b-a(0-1)                                                      =b+a f1(cot x) =sin2xa-b

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