- #1
tmt1
- 234
- 0
So, I have
$$\d{x}{t} = 20 sex^2∂ \d{∂}{t}$$
And the text goes to:
$$ \d{∂}{t} = \frac{1}{20}cos^2 ∂ \d{x}{t}$$
I don't understand where the cos comes from? Is it a trigonometric identity? If so I can't find it.
$$\d{x}{t} = 20 sex^2∂ \d{∂}{t}$$
And the text goes to:
$$ \d{∂}{t} = \frac{1}{20}cos^2 ∂ \d{x}{t}$$
I don't understand where the cos comes from? Is it a trigonometric identity? If so I can't find it.