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 .
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 =