Teaching UP TGT Mock Test Series 2025 Quantitative Aptitude Trigonometry

मान लीजिए ABC एक त्रिभुज है जिसका क्षेत्रफल 36 वर्ग cm है। यदि AB = 9 cm, BC = 12 cm और ∠ABC = θ, तो cos θ किसके बराबर है?

1
\(\frac{\sqrt{5}}{3}\)
2
\(\frac{\sqrt{5}}{4}\)
3
\(\frac{1}{3}\)
4
\(\frac{2}{3}\)
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