May someone show me how to solve this problem?
Find the exact value of the trigonometric function. Do not use a calculator.
5) sin 5π/4

Question

May someone show me how to solve this problem?
Find the exact value of the trigonometric function. Do not use a calculator.
5) sin 5π/4

anonymous · Answer

Please :( can someone help me, its pre-calc

hero · Answer

Hint: Let $\pi = 180$

anonymous · Answer

-_- omg... is it -sqrt2/sqrt2?

hero · Answer

Yup, you got it

anonymous · Answer

lol i feel so dumb now lol XD thanks!

hero · Answer

Why? The technique of letting pi = 180 is not very popular.

hero · Answer

In fact, your teacher may not approve of the steps

anonymous · Answer

oh because in my class we had to draw out a circle with different measuements and memorize it, and i completely forgot that i was supposed to use the circle to solve it

hero · Answer

I mean I would solve it algebraically as you have using the substitution of pi with 180, but the thing is, now that you know what the exact value is, you can still do it the way your teacher wants.

hero · Answer

letting pi = 180 saves you from having to memorize the circle.

hero · Answer

There's another technique that amistre 64 knows that's a huge shortcut for memorizing the unit circle that I know you would like. Ask him about it.

anonymous · Answer

Oh okay thankyou(: I'd rather do that than draw out a circle everytime lol