LINES GO DOWN, KIDS
m-mr. stone.
When you write
sin -20°
on the board, I assume that you're going to use this to find something else. Especially if you're going to go on about it for more than five minutes. I keep waiting for you to use it to find a referential angle or the tangent or something, but no, you just keep that one angle, and you keep talking about it.
TEN MINUTES LATER, this is what you finally conclude the ~lesson~ with:
sin -20° = -sin 20°.
...
I laughed.
Really, really hard.
Like...anyone who even remotely fucking knows how sines work will know that. That's almost insulting. Except that instead of just saying that, he had to spend ten minutes of class time on it, which makes it stop being insulting and start being really fucking funny.
Let me explain: When you take ten minutes to prove that the negative sine of theta equals the sine of negative theta, what you have just proven to the class is that if you draw a vertical line through a circle, it will, shockingly, go downwards.
He didn't even have to use the three diagrams he did. He could have just said "This is a negative twenty degree angle. The sine of this is the sine of negative twenty degrees. Since a negative twenty degree angle is a twenty degree angle flipped over the X axis, the sine of negative twenty degrees is also the negative sine of twenty degrees."
BUT NO HE'S AN IDIOT.
oh god, I couldn't stop laughing for a period afterwards. Like, way to teach a class for ten minutes and prove nothing.
When you write
sin -20°
on the board, I assume that you're going to use this to find something else. Especially if you're going to go on about it for more than five minutes. I keep waiting for you to use it to find a referential angle or the tangent or something, but no, you just keep that one angle, and you keep talking about it.
TEN MINUTES LATER, this is what you finally conclude the ~lesson~ with:
sin -20° = -sin 20°.
...
I laughed.
Really, really hard.
Like...anyone who even remotely fucking knows how sines work will know that. That's almost insulting. Except that instead of just saying that, he had to spend ten minutes of class time on it, which makes it stop being insulting and start being really fucking funny.
Let me explain: When you take ten minutes to prove that the negative sine of theta equals the sine of negative theta, what you have just proven to the class is that if you draw a vertical line through a circle, it will, shockingly, go downwards.
He didn't even have to use the three diagrams he did. He could have just said "This is a negative twenty degree angle. The sine of this is the sine of negative twenty degrees. Since a negative twenty degree angle is a twenty degree angle flipped over the X axis, the sine of negative twenty degrees is also the negative sine of twenty degrees."
BUT NO HE'S AN IDIOT.
oh god, I couldn't stop laughing for a period afterwards. Like, way to teach a class for ten minutes and prove nothing.