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OpenStudy (anonymous):
cos(285[degrees]) Exact value?
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OpenStudy (precal):
just put it in the calculator? .2588190451
OpenStudy (agent0smith):
precal they need an exact value. cos285 = cos75 Now you can use angle sum formulas, since cos75 = cos(45+30) cos(A+B) = cosAcosB + sinAsinB cos(30+45) = cos30cos45 + sin30sin45 And you can use an exact values chart for those and solve it. This should help if you get stuck: http://www.mathwarehouse.com/trigonometry/identities/angle-sum-formula.php
OpenStudy (precal):
|dw:1355173737483:dw|
OpenStudy (precal):
Even/Odd Identities cos(-75)=cos75
OpenStudy (precal):
|dw:1355173873177:dw|
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