If sin θ = 3/5 and θ is acute then what is cos θ?
यदि sin θ = 3/5 और θ acute है तो cos θ का मान क्या होगा?
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Correct Answer
B. 4 / 5
ExplanationStep 1: Use identity sin²θ + cos²θ = 1. Step 2: cos²θ = 1 - 9/25 = 16/25 so cosθ = 4/5. Step 3: For an acute angle cos is positive.
Step 1: Identity sin²θ + cos²θ = 1 लगाएं। Step 2: cos²θ = 1 - 9/25 = 16/25 इसलिए cosθ = 4/5। Step 3: Acute angle में cos positive होता है।