結果 : is 1 sinx equal to cos x
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prove cos(x) / (1 + sin(x)) - (1 - sin(x))/cos(x) = 0

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IB HL AA Mathematics Paper 1 (Functions Part 2)

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verify (1 + sin(x))/cos(x) + cos(x)/(1 + sin(x)) = 2sec(x)

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prove sec x + tan x = cos x / (1 - sin x)

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Verify the Trig Identity (1 + cos(x))/sin(x) = csc(x) + cot(x)

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