Q. Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer.sin(θ)=−21
Identify Sine Value: The equation sin(θ)=−21 implies that θ is an angle whose sine is −21. We know that the sine function has a value of −21 at specific angles in the third and fourth quadrants of the unit circle, where the sine values are negative.
Find Reference Angle: The reference angle for which the sine has a value of 21 is 30 degrees or 6π radians. In the third and fourth quadrants, we need to find the angles that have this reference angle but with a negative sine value.
Third Quadrant Angle: In the third quadrant, the angle with a sine of −21 is 180 degrees + 30 degrees, which is 210 degrees or in radians, π+6π, which simplifies to 67π.
Fourth Quadrant Angle: In the fourth quadrant, the angle with a sine of −21 is 360 degrees −30 degrees, which is 330 degrees or in radians, 2π−6π, which simplifies to 611π.
General Solutions: Since the sine function is periodic with a period of 2π, we can add any integer multiple of 2π to our solutions to get the general form of the solutions. Therefore, the general solutions are (7π)/6+2kπ and (11π)/6+2kπ, where k is any integer.