Question

Give the exact value of each of the following: -sin π/4

Answer 1

\[\large -\sin (\frac{\pi}{4}) \implies - \frac{1}{\sqrt{2}}\]

You can do rationalization here..

Answer 2

Because:

\[ \sin (\frac{\pi}{4}) \implies \frac{1}{\sqrt{2}}\]

Answer 3

prove it :p