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OpenStudy (anonymous):
Somone got counting formulas for me that i can prove? eg: tan(pi + X)= (1+tanx )/ (1-tanX)
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OpenStudy (anonymous):
lhs=tan( pi+x)=tanx rhs=(1+tanx)/(1-tanx)=( 1+sinx/cosx)/(1- sinx/cosx)=cosx+sinx/cosx-sinx
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