Math Question: Find the derivative of f(x) = 3x^4 - 2x^3 + 5x^2 - 7x + 1.
+
Math question: Using the rule of congruence of triangles, if triangle ABC is congruent to triangle XYZ, what can we conclude about their corresponding angles and sides?
+
What is the length of an unknown side in a triangle with two known side lengths of 10 and 15, and an included angle of 45 degrees?