I'm teaching myself Trigonometry & Precalculus, so please bear with me if possible. I have a book called "Mathematics for the international student".

1.$\displaystyle y=3six(x)$

2.$\displaystyle y=\sqrt{7}six(x)$

3.$\displaystyle -2six(x)$

If the amplitude of the normal sin function is 1.

Then I'm assuming the amplitude changes when the function is the product of something.

1. 3

2. $\displaystyle \sqrt{7}$

3. -2