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Mathematics 14 Online
OpenStudy (anonymous):

Solve cos(20-30). Help, please.

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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