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

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