maths (trigonometry)

1+sin a- cos a/1+sin a +cos a eual to ?.

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  1. Multiply both numerator and denominator by the conjugate, (1+sin(a)-cos(a))

    To reduce typing, will use s=sin(a), c=cos(a),
    (1+sin(a)- cos(a))/(1+sin(a)+cos(a))
    now use s²+c²=1
    cancel 2(1+s) assume s≠-1

    Check my work.

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