Question

Pre-cal 12 Question


Please show me how to get those answers.

Answer 1

Your answer is correct.

Answer 2

I agree.

Answer 3

No please show me how to get the answer.

Answer 4

The work is in the image itself.

Answer 5

You need to know that
sin pi/4 = sqrt2/2
sin 3pi/4 = sqrt2/2
sqrt 9pi/4 = sqrt2/2
sqrt 11pi/4 = sqrt2/2

You can easily figure this out if you imagine the unit circle.

Answer 6

This is not clear for me. Please show it algebrically

Answer 7

Please solve algebrically

Answer 8

I don't know what you mean. There is barely any algebra in the question. The only algebra there is is diving both sides by sqrt2.

"pi/4 is 45 degrees. If you draw a 45-45-90 degree triangle, the sides opposite the 45 degree angles are 1 unit long each, and the side opposite the 90 degree angle is sqrt(2) units long. Therefore, the sine of 45 is 1/(sqrt(2)), which is equal to sqrt(2)/2 (they don't like to have sqrts in the denominator)."

https://answers.yahoo.com/question/index?qid=20081108200017AAgsZzM

Answer 9

I know but in the picture, there are two answers, one for x and one for 2x which I do not understand why

Answer 10

Oh, they first found all the angles that could work.

And that meant 2x = all those four angles

And we needed to find x, so we divided by 2, and got pi/8, and the rest of the angles.

Answer 11

The unit circle will show you that there are 4 angles at which you can get six = sqrt2/2

http://i.stack.imgur.com/r8uHr.gif

Answer 12

sin x = sqrt2/2**

Answer 13

Ok that is helpful