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If (\theta) is in the first quadrant and (\sin \theta=\frac{5}{13}), what is (\cos \theta)?यदि (\theta) प्रथम चतुर्थांश में है और (\sin \theta=\frac{5}{13}), तो (\cos \theta) का मान क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (\frac{12}{13})(\frac{12}{13})
( \cos^2 \theta=1-\sin^2 \theta=\frac{144}{169}), and in the first quadrant it is positive. In exams do not forget quadrant sign.(\cos^2 \theta=1-\sin^2 \theta=\frac{144}{169}) और प्रथम चतुर्थांश में मान धनात्मक है। परीक्षा में quadrant sign न भूलें।
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