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Trigonometric Functions (The Six Functions (Tangent (tan) ((y/x)),…

- - - - Examples
        
        Numbers are in radians
        cos(a)=(-4/5) and sin(B)=(5/13)
        =((-3/5)(12/13))-((-4/5)(5/13))
        =(-16/65)
        cos(x-pi)=cos(x)cos(pi)+sin(x)sin(pi)
        =(cos(x))(-1)+(sin(x))(0)
        =-cos(x)
        (in degrees) tan(330-45)
        =(tan(330)-tan(45))/(1+tan(330)tan(45))
        =(-((sqrt3)/3)-1))/(1-((sqrt3)/3)(1)
        =(-3-(sqrt3))/(3-(sqrt3))
        Multiply by Reciprocal
        =(-9-6(sqrt3)-3)/(9-3)
        =-2-(sqrt3)