यदि \(\rm tan\:x=-\dfrac{3}{4}\) और x दूसरे चतुर्थांश में है, तो sin x ⋅ cos x का मान क्या है?

1
\(\dfrac{6}{25}\)
2
\(\dfrac{12}{25}\)
3
\(-\dfrac{6}{25}\)
4
\(-\dfrac{12}{25}\)

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