Question

Please Help Asap. Very Hard.

Answer 1

Answer: Your answer is B

Step-by-step explaintion:

The plot

Answer 2

According to the plot, when
`t=0`,

`y_1(0)=a_1\sin0=0`

`y_2(0)=a_2\cos0=a_2`

`a_1` and
`a_2` are the amplitudes of the waves
`y_1` and
`y_2`, respectively. From the plot it's clear that both
`a_1` and
`a_2` are positive, but the maximum value of
`y_2` is evidently smaller than the maximum value of
`y_1`. So
`0<a_2<a_1`, making the answer B.