Question

Prove that: $\frac{cos A}{1-tan A} + \frac{sin A}{1-cot A} =sin A + cos A$
OR,
Evaluate without using trigonometric tables: $\frac{3 cos 55\textdegree}{7 sin 35\textdegree} + \frac{4(cos 70\textdegree .cosec 20\textdegree)}{7(tan 5\textdegree . tan 25\textdegree . tan 45\textdegree .tan 65\textdegree. tan 85\textdegree)}$

Answer 1

hlo

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