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posted by Mohd.Zaid on Monday, April 29, 2013 at 1:58pm.
(secA+tanA)(1-sinA)
just expand and see what happens I'll elide the x's just for ease of typing sec - sec*sin + tan - tan*sin sec - tan + tan - tan*sin sec - sin^2 * sec sec(1-sin^2) sec*cos^2 cos
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