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Trigonometrical Ratios — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSTrigonometrical Ratios2 Marks
Question
Without using trigonometric tables, find the values of:
$\left(\cos 0^{\circ}+\sin 45^{\circ}+\sin 30^{\circ}\right)\left(\sin 90^{\circ}-\cos 45^{\circ}+\cos 60^{\circ}\right)$
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Answer

$1 \frac{3}{4}$

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