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Find the following trigonometric values.
Express your answers exactly.

{:[cos((5pi)/(3))=◻],[sin((5pi)/(3))=◻]:}

Find the following trigonometric values.\newlineExpress your answers exactly.\newlinecos(5π3)=sin(5π3)= \begin{array}{l} \cos \left(\frac{5 \pi}{3}\right)=\square \\ \sin \left(\frac{5 \pi}{3}\right)=\square \end{array}

Full solution

Q. Find the following trigonometric values.\newlineExpress your answers exactly.\newlinecos(5π3)=sin(5π3)= \begin{array}{l} \cos \left(\frac{5 \pi}{3}\right)=\square \\ \sin \left(\frac{5 \pi}{3}\right)=\square \end{array}
  1. Determine Reference Angle: Determine the reference angle for (5π)/3(5\pi)/3 in the unit circle.\newlineThe angle (5π)/3(5\pi)/3 is more than π\pi but less than 2π2\pi, which means it is in the fourth quadrant of the unit circle. The reference angle is the positive acute angle that the terminal side of (5π)/3(5\pi)/3 makes with the x-axis. To find the reference angle, we subtract (5π)/3(5\pi)/3 from 2π2\pi.\newlineReference angle = 2π(5π)/3=(6π5π)/3=π/32\pi - (5\pi)/3 = (6\pi - 5\pi)/3 = \pi/3
  2. Find Cosine: Find the cosine of the reference angle.\newlineThe cosine of π/3\pi/3 is known from the unit circle to be 1/21/2. Since (5π)/3(5\pi)/3 is in the fourth quadrant and the cosine is positive in the fourth quadrant, the cosine of (5π)/3(5\pi)/3 is also 1/21/2.\newlinecos((5π)/3)=cos(π/3)=1/2\cos((5\pi)/3) = \cos(\pi/3) = 1/2
  3. Find Sine: Find the sine of the reference angle.\newlineThe sine of π/3\pi/3 is known from the unit circle to be 3/2\sqrt{3}/2. However, since (5π)/3(5\pi)/3 is in the fourth quadrant and the sine is negative in the fourth quadrant, the sine of (5π)/3(5\pi)/3 is the negative of the sine of the reference angle.\newlinesin((5π)/3)=sin(π/3)=3/2\sin((5\pi)/3) = -\sin(\pi/3) = -\sqrt{3}/2

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