Q. Find the following trigonometric values.Express your answers exactly.cos(35π)=□sin(35π)=□
Determine Reference Angle: Determine the reference angle for (5π)/3 in the unit circle.The angle (5π)/3 is more than π but less than 2π, 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 makes with the x-axis. To find the reference angle, we subtract (5π)/3 from 2π.Reference angle = 2π−(5π)/3=(6π−5π)/3=π/3
Find Cosine: Find the cosine of the reference angle.The cosine of π/3 is known from the unit circle to be 1/2. Since (5π)/3 is in the fourth quadrant and the cosine is positive in the fourth quadrant, the cosine of (5π)/3 is also 1/2.cos((5π)/3)=cos(π/3)=1/2
Find Sine: Find the sine of the reference angle.The sine of π/3 is known from the unit circle to be 3/2. However, since (5π)/3 is in the fourth quadrant and the sine is negative in the fourth quadrant, the sine of (5π)/3 is the negative of the sine of the reference angle.sin((5π)/3)=−sin(π/3)=−3/2