If sin θ = 5/13 and θ is acute then what is cos θ?
यदि sin θ = 5/13 और θ acute है तो cos θ का मान क्या होगा?
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Correct Answer
B. 12/13 / 12/13
ExplanationStep 1: Use identity sin²θ + cos²θ = 1. Step 2: cos²θ = 1 - 25/169 = 144/169 so cosθ = 12/13. Step 3: For acute angle cos is positive.
Step 1: Identity sin²θ + cos²θ = 1 लगाएं। Step 2: cos²θ = 1 - 25/169 = 144/169 इसलिए cosθ = 12/13। Step 3: Acute angle में cos positive होता है।