cosA/1-tanA+sinA/1-cotA=?
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i don't understand sorry. .....
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{cosA/1/sinA/cosA} +{sinA/1-cosA/sinA}
{cosA/cosA-sinA/cosA}+{SinA/sinA-CosA/SinA}
{cos^2/cosA-sinA}+{sin^2/sinA-cosA}
{cos^2/(cosA-sinA)} -{sin^2/(cosA-sinA)}
cos^2-sin^2/(cosA-sinA)
(cosA+sinA)(cosA-sinA)/(CosA-sinA)
cosA+sinA
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