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in Determinants by (40.4k points)
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सारणिक \(\begin{vmatrix}cos 50°&sin 10°\\sin50°&cos 10°\end{vmatrix}\) का मान है

(a) 0

(b) 1

(c) 1/2

(d) – 1/2

1 Answer

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by (40.7k points)
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Best answer

(c)  \(\begin{vmatrix}cos 50°&sin 10°\\sin50°&cos 10°\end{vmatrix}\) 

= cos 50°.cos 10° – sin 50° sin 10°

= cos (50° + 10°)

= cos 60°

= 1/2

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