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OpenStudy (anonymous):
Hi please help :) How do we prove that ( tan^3 15 deg -3tan^2 15 deg -3tan15deg ) = -1 ?
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OpenStudy (irishboy123):
write as cubic in x and factor out, hint: look at what x = -1 does.
OpenStudy (anonymous):
@IrishBoy123 Got it! thanks for your help :)
OpenStudy (bradely):
Please find the step by step solution http://www.mathskey.com/question2answer/31765/how-do-we-prove-that
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