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Trigonometry
Trigonometric Ratios, The Pythagorean Theorem, Vectors and Trigonometry, Periodic Functions
The Sine and Cosine Formulas, Vectors, Graphs of Sine θ, Cos θ, Tan θ, Trigonometric Ratios of 30º, 45°, 60°
Trigonometric Equations, The Area of a Triangle, Radians, Angular Velocity, Inverse Trigonometric Functions,....more.

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Trigonometric Ratios
 A right-angled triangle can be solved by using any of six trigonometric ratios. These are Sine (Sin), Cosine (Cos), Tangent (Tan),
Cosecant (Cosec), Secant (Sec), and Cotangent (Cot).

Sine and Cosine Formulas
In any triangle, say ABC, containing angles A, B and C in degrees with sides a, b and c,

The Sine Formula states:
     a       =      b      =      c       
Sine A      Sine B      Sine C
               

The Cosine Formulas state:
 a²  =  b²  +  c²  -  2bcCos A
 b²  =  c²  +  a²  -  2caCos B
 c²  =  a²  +  b²  -  2abCos C

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