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OpenStudy (anonymous):
find the exact value of the expression (trig help)
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OpenStudy (anonymous):
2sin45° + 4cos30° and i can't use a calculator
OpenStudy (noelgreco):
Memorize these two triangles, and you'll have the whole unit circle down: |dw:1370461792125:dw|
OpenStudy (anonymous):
okay and how do i solve the expression
OpenStudy (noelgreco):
Well, what's the sine of 45?
OpenStudy (anonymous):
i got it thanks!
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OpenStudy (noelgreco):
YW. I taught my precalculus students how to fill in the unit circle in 10 minutes once they memorized these triangles. Getting them to do the same in radians took a bit longer.
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