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Trigonometrical Ratios — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSTrigonometrical Ratios2 Marks
Question
Without using trigonometric tables, evaluate.
$\frac{\sin 28^{\circ} 54^{\prime}}{\sec 61^{\circ} 6^{\prime}}+\frac{\cos 28^{\circ} 54^{\prime}}{\operatorname{cosec} 61^{\circ} 6^{\prime}}$
✓

Answer

1
$\left[\right.$ Hint . Given exp. $\left.\frac{\sin 29^{\circ} 31^{\prime}}{\cos \left[90^{\circ}-\left(29^{\circ} 31^{\prime}\right)\right.}\right]$.

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