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Trigonometrical Ratios — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSTrigonometrical Ratios2 Marks
Question
Without using trigonometric tables, evaluate.
$\frac{\operatorname{cosec}^2 67^{\circ}-\tan ^2 23^{\circ}}{\sec ^2 20^{\circ}-\cot ^2 70^{\circ}}$
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Answer

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