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OpenStudy (anonymous):
How do I prove tan(x/2) = (tanx)/(secx + 1) ?
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OpenStudy (raden):
use the half angles formula : tan(x/2) = sinx/(1+cosx)
OpenStudy (raden):
then the numerator and the denominator divided by cosx. |dw:1384898929240:dw|
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