As masters wrote in this thread (http://www.mathhelpforum.com/math-he...lp-answer.html) thebis important. For the 1st one, b = 6, and for the 2nd one, b = 1/4.

(BTW, your 2nd one in ambiguous. Some people may think that you mean instead of .)

You have to remember the zeros for y = sin x, which is

;

in other words, multiples of .

So to find the zeros of y = sin bx, divide the zeros I listed above by b. For y = sin 6x, the zeros are

.

I'll let you try the other one.

01