Question
Download Solution PDF\({\cos^215^{\circ} - \sin^215^{\circ}} \over{\cos^2145^{\circ} + \sin^2145^{\circ}}\)का मान ज्ञात कीजिए
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFप्रयुक्त संकल्पना:
Sin2θ + Cos2θ = 1
Cos 2θ - Sin2θ = Cos2θ
गणना:
\({\cos^215^{\circ} - \sin^215^{\circ}} \over{\cos^2145^{\circ} + \sin^2145^{\circ}}\)
⇒ Cos (2 ×15°)
⇒ Cos 30° = \(\sqrt3 \over 2\)
∴ सही विकल्प 3 है
Last updated on Jul 21, 2025
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