If cos 47° sec (90° - θ) = 1; find the angle θ such that 0° ≤ θ ≤ 90°.
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Show that :
tan 56° tan 28° tan 34° tan 62° = 1.
If cos A = sin B, show that A + B = 90°.
Prove that :
sec 40° sin 50° + cos 40° cosec 50° = 2.