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

1/(cosec²53) + sin²37 + tan²53 – 1/(sin²53 sec²37) is

1

sec²37° - 1

2

sec²53°

3

cosec237° - 1

4

cosec253° - 1

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