Prove that :
sec 40° sin 50° + cos 40° cosec 50° = 2.
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If cos 47° sec (90° - θ) = 1; find the angle θ such that 0° ≤ θ ≤ 90°.
If sec (90° - 3A).cos 48° = 1 and 0 ≤ 3A ≤ 90°; find the value of angle A.