defence exam DGAFMS Group C 2025 Mock Test Series Quantitative Aptitude Trigonometry Circular Measure of Angles

1/(cosec2 53) + sin2 37 + tan2 53 – 1/(sin253 sec237) =?

1
sec2 37° - 1
2
sec2 53° 
3
cosec2 37° - 1
4
​cosec2 53° - 1
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