Okay, so when theres like a right triangle, its got 6 different trigonometric things, these are called:
Sin (oposite leg / hypotenuse)
Cosine (adjacent leg / hypotenuse)
Tangent (opposite leg / adjacent leg)
(also simply sin / cos)
Each of these has a reciprocal:
cosecant = 1 / sin
Secant = 1 / cosine
Cotangent = 1 / tangent
These are reciprocals NOT inverses
On the unit circle, the sin = y value and the cos = x value
a trick to remeber: every 15 degrees = pie / 12
examples:
- 30 degrees = 2 pi / 12 = pi / 6
- 45 degrees = 3 pi / 12 = pi / 4
- 90 degrees = 6 pi / 12 = pi / 2
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