Question

Will fan and metal! Verify cos(pi-theta)=-cos(theta)

Answer 1

\(cos (\color{red}{a}-\color{blue}{b}) = cos\color{red}{a}cos\color{blue}{b}+sin\color{red}{a}sin\color{blue}{b}\)
\(cos (\color{red}{\pi}-\color{blue}{\theta}) = cos\color{red}{\pi}cos\color{blue}{\theta}+sin\color{red}{\pi}sin\color{blue}{\theta}\)
can you write down the final sentence?

Answer 2

Final sentence??

Answer 3

@Loser66

Answer 4

hey, cos pi =?

Answer 5

sin pi =?

Answer 6

just plug them in and you get the so-called "verify" , right?

Answer 7

There's nothing else to the problem. Thats all it says so there's nothing to plug in

Answer 8

@iambatman