The least common denominator is cos theta, so I multilplied
`[costheta]/1=[costheta*costheta]/[1*costheta]`
`costheta+tantheta*sintheta=`
`costheta+[sintheta]/[costheta]*sintheta=`
`[costheta*costheta]/[costheta]+[sin^2(theta)]/[costheta]=`
`[cos^2theta+sin^2theta]/costheta=`
`1/[costheta]=sectheta`
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