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math

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(secA+tanA)(1-sinA)

  • math - ,

    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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