if sinA = x/y then find the value of cosA X tanA in term of x and y
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secA + tanA = x/y
rewrite each as function of only sine and cosine
1/cosA + sinA / cosA = x/y
/cosA + sinA / cosA = x/y1 + sinA x
/cosA + sinA / cosA = x/y1 + sinA x----------- = ------
/cosA + sinA / cosA = x/y1 + sinA x----------- = ------ cosA y
/cosA + sinA / cosA = x/y1 + sinA x----------- = ------ cosA yso cosA = y
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