Question
Download Solution PDFযদি sin θ = \(1 \over 2\) হয়, তাহলে (3cos θ - 4 cos3 θ) এর মান হল:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFপ্রদত্ত:
sin θ = \(1 \over 2\)
অনুসৃত ধারণা:
গণনা:
sin θ = \(1 \over 2\)
⇒ sinθ = sin 30°
তাই, θ = 30°
3cos θ - 4 cos3 θ
⇒ 3 × \(\sqrt3 \over 2\) - 4 × \(3\sqrt3 \over 8\)
⇒ \({3\sqrt3 \over 2} - \frac{3\sqrt3}{2}\)
⇒ 0
∴ প্রয়োজনীয় উত্তর হল 0
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