Olympiad problems

2021 AMC 12/AHSME Spring, 11

Triangle $ABC$ has $AB=13,BC=14$ and $AC=15$. Let $P$ be the point on $\overline{AC}$ such that $PC=10$. There are exactly two points $D$ and $E$ on line $BP$ such that quadrilaterals $ABCD$ and $ABCE$ are trapezoids. What is the distance $DE?$ $\textbf{(A) }\frac{42}5 \qquad \textbf{(B) }6\sqrt2 \qquad \textbf{(C) }\frac{84}5\qquad \textbf{(D) }12\sqrt2 \qquad \textbf{(E) }18$

2021 AMC 12/AHSME Spring, 3

Tags: 2021 AMC 12B

Suppose $$2+\frac{1}{1+\frac{1}{2+\frac{2}{3+x}}}=\frac{144}{53}.$$ What is the value of $x?$ $\textbf{(A) }\frac34 \qquad \textbf{(B) }\frac78 \qquad \textbf{(C) }\frac{14}{15} \qquad \textbf{(D) }\frac{37}{38} \qquad \textbf{(E) }\frac{52}{53}$

2021 AMC 12/AHSME Spring, 13

Tags: AMC 12 , 2021 AMC 12B

How many values of $\theta$ in the interval $0<\theta\le 2\pi$ satisfy $$1-3\sin\theta+5\cos3\theta=0?$$ $\textbf{(A) }2 \qquad \textbf{(B) }4 \qquad \textbf{(C) }5\qquad \textbf{(D) }6 \qquad \textbf{(E) }8$

2021 AMC 12/AHSME Spring, 18

Tags: AMC , AMC 12 , AMC 12 B , 2021 AMC 12B

Let $z$ be a complex number satisfying $12\lvert z\rvert^2 = 2 \lvert z+2 \rvert ^2+\lvert z^2+1\rvert ^2+31.$ What is the value of $z+\frac{6}{z}?$ $\textbf{(A) }-2\qquad\textbf{(B) }-1\qquad\textbf{(C) }\frac{1}{2}\qquad\textbf{(D) }1\qquad\textbf{(E) }4$