9x(y+4)-10(y+4)
(9x-10)(y+4)
First we use sin(a+b)= sinacosb+sinbcosa
and cos(a+b)=cosa cosb -sinasinb
tan(x+pi/2)= sin(x+pi/2) / cos(x+pi/2)
and sin(x+pi/2) = sinxcospi/2 + sinpi/2cosx =cosx,
<span>cos(x+pi/2) = cosxcospi/2- sinxsinpi/2= - sinx,
</span> because <span>cospi/2 =0, </span>and <span>sinpi/2=1
</span><span>=tan(x+pi/2)= sin(x+pi/2) / cos(x+pi/2)= cosx / -sinx = -1/tanx = -cotx
</span>from where <span>tan(x+pi/2)=-cotx</span>
Answer:3 units/s
Step-by-step explanation:
Given
Point P lie on this curve so any general point on curve can be written as
and
Distance between Point P and (2,0)
P at x=3 P=2
rate at which distance is changing is
85% of 690 lbs would be 586.5