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\Large y=\mathcal{mx}+\mathcal{b}\




\Large y-y_1=m{(x-x_1)}





\Large m\ =\frac {y-y_1} {x-x_1}






\Large d=sqrt{x_1-x)^2+(y_1-y)}^2








\Large(x-h)^2 + (y-k)^2= r^2






\Large f ( x )= \frac {(x^2-3x+1)^3} {sqrt{(x^4+1)}}






\Large f(t ) = \ cos2t




\Large f ( t) = sen{(t-\frac1\4 \Pi)}





\Large tan^2\theta=sec^2\theta-1




\Large cot^2\theta=csc^2\theta-1