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Great Trigonometry functions cheat sheet: reciprocal, ratio, half/double angle, sum/difference, pythagorean, even/odd identities and other useful trig formulas
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s + c + t + c + s + c +
s + c – t – c + s – c –
s – c – t + c – s – c +
s – c + t – c – s + c –
45 - 45 - 90 Right Triangle
30 - 60 - 90 Right Triangle
3
Law of Sines:
sin A sin sin a
b
c
a b c bc A b a c ac B c a b ab C
2 2 2 2 2 2 2 2 2
Area of a Triangle:
A bh A ab C A ac B A bc A
(^12) (^12) (^12) (^12)
Law of Cosines :