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OpenStudy (anonymous):
#53. cos 2a = cos^2a - sin^2a HINT: WRITE TAN 2A AS TAN (A+A).
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OpenStudy (anonymous):
@perl
OpenStudy (anonymous):
@dan815
OpenStudy (anonymous):
@pooja195
OpenStudy (triciaal):
why reopen the same question? did you follow my previous instructions?
OpenStudy (anonymous):
No because I didnt understand even still
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OpenStudy (anonymous):
I would have to complete this one inorder to complete #54
OpenStudy (triciaal):
|dw:1453242570627:dw|
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