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OpenStudy (anonymous):
cot^2 135-sin210+5cos^2 225 evaluate
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OpenStudy (anonymous):
calculator exercise
OpenStudy (cwrw238):
hints: tan 135 = - tan 45 sin 210 = - sin 30 cos 225 = - cos 45
OpenStudy (ybarrap):
combine this with @cwrw238 's notes and you can do this problem by hand: |dw:1376086218917:dw|
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