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Mathematics 13 Online
OpenStudy (anonymous):

cot^2 135-sin210+5cos^2 225 evaluate

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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