Question

If $y=\cos (5-3t),\frac{dy}{dt}=$

• A. $5\sin (5-3t)$
• B. $3\sin (5-3t)$
• C. $-5\sin (5-3t)$
• D. $-3\sin (5-3t)$

Answer 1

Answer: (B)

$3\sin (5-3t)$

$\frac{dy}{dt}=-\sin (5-3t)\times -3$

$\frac{dy}{dt}=3\sin (5-3t)$