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OpenStudy (sebaxtiangb):
who knows trigonometry? i need help proving cot(a+b)={ cot(a)cot(b) - 1}/cot(b)cot(a)
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OpenStudy (jango_in_dtown):
@sebaxtiangb
OpenStudy (jango_in_dtown):
start from rhs. and put cot a and cot b in the from cos a/sin a and cos b/ sin b.
OpenStudy (jango_in_dtown):
then after a stage you will get (cos a cos b-sin a sin b)/(sin a cos b +cos a sin b)=cos (a+b)/sin(a+b)=cot (a+b)
OpenStudy (sebaxtiangb):
alright thanks
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