defence exam INET Mock Test Mathematics Trigonometry Multiple and Sub-multiple Angles

यदि cos x = - 3 / 5 और x तीसरे चतुर्थांश में हैं, तो sin 2x का मान क्या है?

1
21 / 25
2
– 21 / 25
3
24 / 25
4
– 24 /25
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