Question

is it necessary that all the simple harmonic motion has to be of sin or cos type​

Answer 1

Explanation:

The two forms are the same except for the phase term, so which one you use depends on when you started your stopwatch.

If you started off at max displacement at t=0, then you use the cosine form, if you start out with max velocity at t=0, then you use the sine form.

If you are deducing the wave equation from measurements, use either form and let the phase term tell you how close you are. It

Answer 2

$\huge\bold{\mathtt{\red{A{\pink{N{\green{S{\blue{W{\purple{E{\orange{R}}}}}}}}}}}}}$

Explanation:

The two forms are the same except for the phase term, so which one you use depends on when you started your stopwatch.

If you started off at max displacement at t=0, then you use the cosine form, if you start out with max velocity at t=0, then you use the sine form.

If you are deducing the wave equation from measurements, use either form and let the phase term tell you how close you are.

$\huge\mathcal{\fcolorbox{lime}{black}{\pink{Hope it's help u}}}$

$\small\mathbf\red{{Ashubhai01\:here}}$