find the values of cos120°and sin(-150°)
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cos (180-60)
- cos60
- 1/2
sin(-150)= - sin(150)
= - sin ( 180-30)
= - sin30
= -1/2
- cos60
- 1/2
sin(-150)= - sin(150)
= - sin ( 180-30)
= - sin30
= -1/2
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