Question

1. सिध्द कीजिएः cos17× tan17× tan73×cosec73

Answer 1

$= \cos17 \times \tan17 \times \tan73 \times \csc73 \\ = \cos(90 - 73) \times \frac{1}{ \cot17} \times \tan(90 - 17) \times \frac{1}{sin73} \\ = \sin73 \times \frac{1}{ \sin73 } \times \frac{1}{ \cot17 } \times \cot17 \\ = 1$
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