Question

Verify my answers please; Trigonometric Equations

Answer 1

Find all solutions in the interval [0,2pi).
sin^2(x) - cos^2(x) = 0

My answer: x = pi/4, 3pi/4, 5pi/4, 7pi/4

Answer 2

Find an exact value.
cos(-7pi/12)

My answer: \[(\sqrt{2}-\sqrt{6})/4\]

Answer 3

That's it.

Answer 4

yes, your answers are correct

Answer 5

The first is correct :P

Answer 6

Both of them? Awesome @Luigi0210 what do you think?

Answer 7

what is the half-angle formula again?

Answer 8

\[\cos(x/2)=+-\sqrt(1+\cos(x)/2\]

Answer 9

I'm not exactly sure about the second one.. but Raden said they were correct so I guess it might be right ^_^'

Answer 10

lol ok, thank you

Answer 11

Any time :P