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Sum
If sec A = cosec A and 0° ∠A ∠90°, state the value of A
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Solution
sec A = cosec A
cos A = sin A
cos2A = sin2A
cos2 A = 1 – cos2A
2cos2A = 1
cos A = `(1)/(sqrt2)`
A = 45°
Concept: Trigonometric Ratios of Some Special Angles
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