Which equation can be used to prove 1 + tan2(x) = sec2(x)?




Suppose tan(x) = , and the terminal side of x is located in quadrant I. What is sin(x)?





Which angle has a terminal side in quadrant III?
A waterwheel has a radius of 4 feet, and the center of the wheel is 1 foot under the waterline. You notice a yellow mark at the top of the wheel. If the wheel rotates radians, how far above the water is the yellow mark?

On which interval is y = sin(x) strictly increasing?




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