tana-sina/sin^3A=secA/(1+cosa)
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LS = (tanA-sinA)/sin^2 A
= (sinA/cosA - sinA)/sin^2 A
= ( (sinA - sinAcosA)/cosA) /sin^2 A
= (sinA(1 - cosA)/cosA)/sin^2 A
= (1 - cosA)/(sinAcosA)
RS = (sinA/cosA) / (1 + cosA)
= (sinA/cosA) / (1 + cosA) * (1-cosA)/(1-cosA)
= (sinA/cosA)(1-cosA)/(1 - cos^2 A)
= (sinA/cosA)(1-cosA)/sin^2 A
= (1-cosA)/(sinAcosA)
= LS
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