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OpenStudy (anonymous):
Solve cos(20-30). Help, please.
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OpenStudy (anonymous):
cos 20 . cos30 +sin20.sin30
OpenStudy (anonymous):
I took cos(20-30) from that identity. Can it not be simplified anymore?
OpenStudy (anonymous):
it is the simplest form (As i know) u can type it on the calculator & get the result
OpenStudy (anonymous):
Yeah, but I need radical form. Thank you.
OpenStudy (phi):
what is wrong with cos(-10), which is simply cos(10)?
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