[" If "x cot^(2)120^(@)+4sin^(2)150^(@)=3," then "x=],[[" a) "1," b) "7," c) "6," d) "5]]

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If xtan^(2) 120^(@) + 4 cos^(2) 150^(@) = 9 then x =

x tan^(2)120^(@)+4cos^(2)150^(@)=9rArr x=1)3213)24)4

tan^(2)120^(@)+cos^(2)150^(@)-sin^(2)300^(@)

cot x cos^(2)x-tan x sin^(2)x=2cot2x

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(cos2x-1)cot^(2)x=-3sin x

Prove that, cot x cos^(2)x -tan x sin^(2)x = 2 cot 2x

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lim_(x to 0)(x cot(4x))/(sin^(2) x cot^(2)(2x)) is equal to

Prove : int (cos^(4)x)/(sin^(2)x) dx = - ( (3x)/2 + 1/4 sin2x + cot x ) + c