Question
जर $\cos \theta=\frac{24}{25}$, तर $\sin \theta=$ ?

Answer

$\cos \theta=\frac{24}{25}$.............[दिलेले]
आपल्याला माहीत आहे, की,
sin2θ + cos2θ = 1
$\begin{array}{l}\therefore \sin ^2 \theta+\left(\frac{24}{25}\right)^2=1
\\ \therefore \sin ^2 \theta+\frac{576}{625}=1\end{array}$
∴ sin2θ =$1-\frac{576}{625}$
∴ sin2θ =$\frac{625-576}{625}$
∴ sin2θ = $\frac{49}{625}$
∴ sin2θ = $\frac{7}{25}$....[दोन्ही बाजूंची वर्गमुळे काढून]

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