My math teacher was feeling depressed.

I told him he should get to the root of the problem quickly before he starts feeling sinusoidal.

Studying waveforms as a dyslexic can be depressing.

When I can't calculat lambda, I just feel sinusoidal.

My nose gets clogged and unclogged periodically

It's sinusoidal

What do you call a manic-depressive math professor with suicidal tendencies?

Sinusoidal.

What’s a mathematician’s feared illness?

A sinusoidal infection.

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