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OpenStudy (anonymous):
Help please! I need to use identities to prove this! tan8k-tan8k*tan^2(4k)=2tan4k
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OpenStudy (anonymous):
tan 8k(1-tan^4k) ={2 tan 4k/(1-tan^2 4k)}*1-tan^2 4k =2tan 4k
OpenStudy (anonymous):
thank you!
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