http://www.mathhelpforum.com/math-he...lp-answer.html) the b is 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.