Evaluate.......
Class 11th.
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sin390 × cos 120
sin( 360+30) × cos(180-60)
sin30 × - cos60
1/2 × -1/2
-1/4
Answered by
5
ஜ۩۞۩ஜ[ welcome to the concept of Trigonometry ]ஜ۩۞۩ஜ
sin 390° × cos 120°
= sin ( 4×90+30)× cos (90+30)
= sin 30×( -sin30)
= -1/4
= -0.25
✨I hope it help you ❤️
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