# Finding the x intervals of a trigonometric function.?

My paper is almost due and I can’t figure out these problems. It is wanting me to list the x intervals of the following functions.
1. 4sin(26x-pi/5) [0, pi/13]
2. -18sin(6x-pi/5) [0, pi/3]
3. -28cos(26x-pi/3) [0, pi/13]
4. 4cos(14x+pi/3) [0, pi/7]
Some explanations on the problems would also be very helpful! Thank...
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My paper is almost due and I can’t figure out these problems. It is wanting me to list the x intervals of the following functions.

1. 4sin(26x-pi/5) [0, pi/13]

2. -18sin(6x-pi/5) [0, pi/3]

3. -28cos(26x-pi/3) [0, pi/13]

4. 4cos(14x+pi/3) [0, pi/7]

Some explanations on the problems would also be very helpful! Thank you!

1. 4sin(26x-pi/5) [0, pi/13]

2. -18sin(6x-pi/5) [0, pi/3]

3. -28cos(26x-pi/3) [0, pi/13]

4. 4cos(14x+pi/3) [0, pi/7]

Some explanations on the problems would also be very helpful! Thank you!

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