SSC CPO 2020 PYQ — Question 141

SSC CPO - 25 Nov 2020 - Shift 1 • Quantitative Aptitude • Q141

If 4(cosec2 57 -  tan2 33) - cos90 + y tan2 66 tan2 24 = y/2, then the value of y is:

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Correct answer: D

Explanation

The correct answer is Option 4 i.e 838\over3.

4(cosec2 57 -  tan2 33) - cos90 + y tan2 66 tan2 24 = y/2

Fromuale:

cosec2θ - cot2θ = 1

tan(90 - θ) = cotθ

Now, according to the question

⇒ 4(cosec2 57 -  tan2 33) - cos90 + y tan2 66 tan2 24 = y/2

⇒ 4(cosec2 57 -  cot2 (90 - 33) - cos90 + y tan2 66 cot2(90 - 24) = y/2

⇒ 4(cosec2 57 -  cot257) - cos90 + y tan2 66 cot266 = y/2

⇒ 4 - 0 - y = y/2

⇒ 8 = 3y

⇒ y = 838\over3