What is the equation of an ellipse centered at (h,k), with a major axis of length 2a parallel to the x-axis and a minor axis of length 2b parallel to the y-axis?
+
Math question: In △ABC and △DEF, if AB = DE, BC = EF, and ∠ABC = ∠DEF, what can be concluded about the triangles according to the rules of congruence?
+
What is the value of sin^(-1)(1) + cos^(-1)(0) - tan^(-1)(1) + cot^(-1)(√3) when applied to an angle in the first quadrant?