यदि \(\theta\) प्रथम चतुर्थांश में है और \(\sin \theta=\frac{5}{13}\), तो \(\cos \theta\) का मान क्या होगा?
If \(\theta\) is in the first quadrant and \(\sin \theta=\frac{5}{13}\), what is \(\cos \theta\)?
Explanation opens after your attempt
A. \(\frac{12}{13}\)
Concept
\( \cos^2 \theta=1-\sin^2 \theta=\frac{144}{169}\), and in the first quadrant it is positive. In exams do not forget quadrant sign.
Why this answer is correct
The correct answer is A. \(\frac{12}{13}\). \( \cos^2 \theta=1-\sin^2 \theta=\frac{144}{169}\), and in the first quadrant it is positive. In exams do not forget quadrant sign.
Exam Tip
\(\cos^2 \theta=1-\sin^2 \theta=\frac{144}{169}\) और प्रथम चतुर्थांश में मान धनात्मक है। परीक्षा में quadrant sign न भूलें।
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