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Pythagoras

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Pythagoras is defined as:

a2 + b2 = c2

which can be rewritten as:
a2 = c2 - b2

b2 = c2 - a2

c2 = a2 + b2  or c = √(a2 + b2)

The following functions describe the ratios of the triangle sides.

sinA = a/c

cosA = b/c

tanA = a/b

cotA = b/a

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