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Questions  

If tanθ,2tanθ+2 and 3tanθ+3 are in GP, then the value of 75cotθ94sec2θ1 is

a
125
b
-3328
c
33100
d
1213

detailed solution

Correct option is C

Since,  (2tan⁡θ+2)2=tan⁡θ(3tan⁡θ+3)⇒ 4tan2⁡θ+8tan⁡θ+4=3tan2⁡θ+3tan⁡θ⇒  tan2⁡θ+5tan⁡θ+4=0⇒  tan⁡θ+4)(tan⁡θ+1)=0⇒ 7−5cot⁡θ⇒ 7+54=39−4(−4)=33100

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