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OpenStudy (anonymous):
Without using a calculator, find the exact value of : sin210-cos330tan330
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OpenStudy (anonymous):
start with \[\sin(210)-\sin(330)\]
OpenStudy (anonymous):
But do you get sin(-120) from that?
OpenStudy (anonymous):
Nevermind. You don't.
OpenStudy (goformit100):
Use Trignometry....
OpenStudy (anonymous):
Should I sketch the graph for them? O_o
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OpenStudy (anonymous):
think of where these points are on the unit circle
OpenStudy (anonymous):
one is 60 degrees less than 270, the other is 60 degrees larger than 270, so even without knowing what the answer is, when you add them you must get 0
OpenStudy (anonymous):
i mean when you subtract them sorry
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