Follow the below steps to find the inverse of any function. I'm unsure if that solves the last problem, though plugging it into Wolfram Alpha will tell you. This calculator to find inverse function is an extremely easy online tool to use. Another good rule of thumb is that if one interpretation gives an algebraic answer, use that interpretation. If it's unspecified and of the form $360/n$ for some integer $n$, use degrees. If it's unspecified and a $\pi$ shows up, you should assume radians. Physics Engineering Waves Signals interference superposition The demo above displays two sine waves, coloured blue and red. In contexts where you think your professor has simplified by opting to not use the degree symbol, some general rules of thumb can be applied. An interactive demo which enables you to both see and hear the result of adding two sine waves of different frequencies. If none of the problems had been marked with a degree symbol, I might think otherwise since $42.5$ is much bigger than $2\pi$. Press the 'Window' key, highlight 'Format' and select the 'Axes Off' option. This removes the scaling distortion from the viewing window. Press the 'Zoom' key and select 'Zoom Square' from the drop-down menu. I would guess that $42.5$ is supposed to be in radians, because everywhere else in the problem the professor has been careful to use the degree symbol, making me think its omission is deliberate. Enter the equations '3 sqrt (4- (x 4) 2 )' and '3-sqrt (4- (x 4) 2 )' in the fields labeled 'Y6' and 'Y7.' This forms the left eye. This interpretation agrees with the rules of thumb that I am about to give everywhere that it's applicable, leaving the last problem. If you have been taught the technically correct rule, definitely use it. However, humans tend to be bad at being technically correct, so if you haven't been told to use radians unless otherwise specified I would consider making contextual judgement calls. The technically correct thing to do is to assume that everything is in radians unless otherwise specified. The ° symbol means "degrees." Any answer marked with that is definitely in degrees.
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