Question

2 questions guys. Need Answers Quick Please!

1) Write (cos theta -1)/(sin theta) in terms of a single trigonometric function
a)tan theta/2
b)-tan theta/2
c)tan theta
d)-tan theta

2)Write 1 - 2sin^2(2theta) in terms of a single trigonometric function
a)sin4theta
b)sin2theta
c)cos4theta
d)cos2theta

Thanks!

Answer 1

I sincerely hope this is not some test/quiz problem. We cannot give you direct answers.

Answer 2

But that doesn't mean I can't give you hints :)

Answer 3

For problem 1:

Use this:

\[\large{cos(\theta) = 1 - 2\sin^2{\cfrac{\theta}{2}}}\]

Answer 4

For problem 2:

Use the one I mentioned in hint for problem 1

Answer 5

I think i got number 2. Is it Cos4theta? and im still lost with the first problem

Answer 6

1st one is easier, with the hint given.

Answer 7

Is the second one right? Can you walk me through the first one?

Answer 8

it's identities. Do you know about it ?

Answer 9

ya which identity? the chapter i studied only had double angle identities, power reducing identities and half angle identities

Answer 10

I'll give you all the formulas required, you solve it, if you can't. I'll help you then. :)

Answer 11

K thanks!