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OpenStudy (anonymous):
Use the appropriate identity to find the exact value of the expression: cos(15 degrees)
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OpenStudy (jdoe0001):
15 = 40 - 30 thus \(\bf cos(15^o)\implies cos(45^o-30^o)\)
OpenStudy (jdoe0001):
ahem 15 = 45-30 of course =) anyhow
OpenStudy (anonymous):
So the final answer I got using the cos45cos30+sin45sin30 was \[[\sqrt6+\sqrt2]/4\]! Does that sound right?! Seriously thank you for all of your help, trig is not my strong suit.
OpenStudy (jdoe0001):
yeap
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