RRB NTPC Mains or Stage 2 Model Paper 4 with solutions

Question : 19 of 120

Marks: +1, -0

{cos x} /{1 + cosec x}+{cos x} /{cosec x -1}= 2,

then which one of the following is one of the values of x?

Solution:

{cos x }/{1+cos x} + {cosec x} /{cosec x -1}

⇒ 2{2 cos x cosec x}/ {cosec^2 x -1}=2

⇒ {cos x cosec x}/{cot^2 x}=1

⇒ tan x = 1

⇒xπ/4

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