Question 207935
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This question is from textbook College Math 1
Given a point (5,-5) on the terminal side of angle0, find the value of sin.
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The answer in the post by @HyperBrain   " sin(x) = sin(135) = sin(45) = {{{sqrt(2)/2}}} "   is  INCORRECT.


The correct answer is   " sin(x) = sin(315) = {{{-sqrt(2)/2}}} ".


The general error by @hHyperBrain is that he thinks that the angle is in QII, while in reality it is in QVI.



So far, I checked about 30 solutions by @HyperBrain, and found that 7 of them are solved incorrectly.


It is very sad to see so low level tutors at this forum.


In reality, it is not an allowed level for a tutor - it is a level of average student, whose typical score in Math is 3 of 5.

His goal should be to learn for himself - not to deceive other people by presenting himself as a tutor.