Hard Math Class 11 Level 1

If sin θ = 3/5 and θ is acute then what is cos 2θ?

यदि sin θ = 3/5 और θ acute है तो cos 2θ का मान क्या होगा?

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Correct Answer

A. 7/25 / 7/25

Explanation

Step 1: Use cos 2θ = 1 - 2sin²θ. Step 2: 1 - 2×9/25 = 7/25. Step 3: In double angle questions choose the formula based on the given trig ratio.

Step 1: cos 2θ = 1 - 2sin²θ लगाएं। Step 2: 1 - 2×9/25 = 7/25 मिलता है। Step 3: double angle में दिए गए trig ratio के अनुसार formula चुनें।

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