Question:medium

Find the values of other five trigonometric functions if  \(sin\,x=-\frac{3}{5},\) x lies in second quadrant.

Updated On: Jan 27, 2026
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Solution and Explanation

\(sin\,x=\frac{3}{2}\)

\(cosec\,x=\frac{1}{sin\,x}=\frac{1}{(\frac{3}{5})}=\frac{5}{3}\)

\(sin^2x+cos^2\,x=1\)

\(⇒cos^2x=1-sin^2x\)

\(⇒cos^2x=1-(\frac{3}{5})^2\)

\(⇒cos^2x=1-\frac{9}{25}\)

\(⇒cos^2\,x=\frac{16}{25}\)

\(⇒cos^2\,x=±\frac{4}{5}\)

Since x lies in the 2nd quadrant, the value of cos x will be negative

\(∴cos\,x=-\frac{4}{5}\)

\(sec\,x=\frac{1}{cos\,\,x}=\frac{1}{(-\frac{4}{5})}=-\frac{5}{4}\)

\(tan\,x=\frac{sin\,x}{cos \,x}=\frac{(\frac{3}{5})}{(-\frac{4}{5})}=\frac{3}{4}\)

\(cot\,x=\frac{1}{tan\,x}=\frac{4}{3}\)

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