2+2=?
tan -12800degrees
f(x) = 2x^4 + 5x^3 - 15x^2 - 10x + 8
2x+4=14
89-w=260
$$6x=\frac{x}{30}+4$$
f(x)=4x-x^2-7
−21x^3y^4z^5-23x^7y^7z^3
4x-x^2-7
tan -2800degrees