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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 :
$4\left(\sin ^4 30+\cos ^4 60\right)-3\left(\cos ^2 45-\sin ^2 90\right)$.
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Answer

2

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