Natural Trigonometric Functions

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Natural trigonometric functions are expressed as

sin θ = a / c

    = cos (π / 2 - θ)         (1)

cos θ = b / c

    = sin (π / 2 - θ)         (2)

tan θ = a / b

    = sin θ / cos θ

    = 1 / cot θ

    = cot (π / 2 - θ)         (3)

cot = 1 / tan θ

    = cos θ / sin θ

    = tan(π / 2 - θ)         (4)

Trigonometric functions ranging 0 to 90 degrees are tabulated below:

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