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Trigonometrical Ratios of Standard Angles — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSTrigonometrical Ratios of Standard Angles2 Marks
Question
Evaluate the following$: \operatorname{cosec} 54^\circ - \sec 36^\circ $
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Answer

$ \operatorname{cosec} 54^\circ - \sec 36^\circ$
$= \operatorname{cosec}(90^\circ - 36^\circ ) - \sec36^\circ$
$= \sec36^\circ - \sec36^\circ$
$= 0. $

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