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(SinA/cosA) / {(1/cosA)-1} + (SinA/cosA) / {(1/cosA)+1}
(SinA/cosA) / {(1-cosA)/cosA} + (SinA/cosA) / {(1+cosA)/cosA}
{(SinA/cosA).(cosA)/(1-cosA)} + {(SinA/cosA).(cosA)/(1+cosA)}
(SinA/(1-cosA) + (SinA/(1+cosA)
Samakan penyebutnya
{SinA(1+cosA) + SinA(1-cosA)} / {(1+cosA)(1-cosA)}
{SinA+sinAcosA + SinA-sinAcosA)} / (1-cos^2 A)
2sinA / sin^2 A
= 2/sinA
= 2cosecA