Thinking Backwards
What is pi/4?
This is the value (to the nearest degree) of arccos(0.42). (If it exists...)
What is 65 degrees?
These are the two solutions from 0 to 360 degrees for:
2sin(x) - 1 = 0.
What are 30 and 150 degrees?
This is the 2nd quadrant radian solution to (tan x)^2 - 1 = 0.
What is 3pi/4?
This is the value (in degrees) of arcsin(-1).
What is -pi/2?
This is the value (in radians) of arccos(-sqrt(3)/2).
What is 5pi/6?
These are the two solutions from 0 to 360 degrees for:
tan(x) + 1 = 0
What are 135 and 315 degrees?
This is the 4th quadrant degree solution to (sin x)^2 = 3/4.
What is 300 degrees?
This is the value (in radians) of arctan(-sqrt(3)).
What is -pi/3?
This is the value (to the nearest degree) of arcsin(-0.94). (If it exists...)
What is -70 degrees?
These are the two radian solutions from 0 to 2pi for
4cos(x) = 1 + 2cos(x).
What are pi/3 and 5pi/3?
This is the 3rd quadrant solution (in degrees) to:
4(cos x)^2 - 1 = 0.
What is 240 degrees?
This is the value of arccos(0).
What is pi/2?
This is the value (to the nearest degree) of arccos(-12). (If it exists...)
What is "does not exist"?
These are the two radian solutions from 0 to 2pi for:
3sqrt(3)*tan(x) = 3.
What are pi/6 and 7pi/6?
This is the 1st quadrant solution (in degrees) to:
(csc x)^2 - 2 = 0
What is 45 degrees?
This is the value of arctan(-1).
What is -pi/4?
This is the value of arctan(tan 11pi/6).
What is -pi/6?
These are the two radian solutions from 0 to 2pi for:
sin(x) = sqrt(3) - sin(x).
What are pi/3 and 2pi/3?
This is the 2nd quadrant solution (in radians) to the equation:
(cot x)^2 - 3 = 0
What is 5pi/6?