The value of is (2sin238° - sec252° + cos64° sin26º+sin264º)/tan223º+cot223º-sec267º-cosec267º):
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e.
Concept
sin(90° - θ) = cosθ
tan(90° - θ) = cotθ
cot(90° - θ) = tanθ
sin2θ + cos2θ = 1
cosec2θ - cot2θ = 1
sec2θ - tan2θ = 1
Application
[2sin2(90° - 52°)sec252° + cos64° sin(90° - 64°) + sin264°}/{tan2(90° - 67°) - cosec267° + cot2(90° - 67°) - sec267°]
[2cos252° sec252° + cos64° cos64° + sin264°}/{cot267° - cosec267° + tan267° - sec267°]
[2 + (cos264° + sin264°)}/{ - (cosec267° - cot267°) - (sec267° - tan267°)]
We know that, sin2θ + cos2θ = 1, cosec2θ - cot2θ = 1 and sec2θ - tan2θ = 1
(2 + 1)/(-1 - 1)
-3 / 2