정답
$\sin(x) = \cos(90^\circ - x)$, or in radians $\sin(x) = \cos\left(\frac{\pi}{2} - x\right)$.
해설
A Digital SAT staple: if $\sin(a) = \cos(b)$ for acute angles $a$ and $b$ in a right triangle, then $a + b = 90^\circ$ (or $\frac{\pi}{2}$).
홈 / 라이브러리 / Digital SAT Math: Algebra, Advanced Math & Geometry / AI 플래시카드
What is the fundamental cofunction identity relating sine and cosine for complementary acute angles?
덱 'Digital SAT Math: Algebra, Advanced Math & Geometry'의 플래시카드.