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 $0$, making the answer B.