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:
m = - 3 / 4
Step-by-step explanation:
1m + 3/4 = 0
m = - 3 / 4
hope this helps
Answer:
72 m\ p.h.
Step-by-step explanation:
we have 60 minute in one hour
we must divide 60 by 5=12
then 6*12=72!!!
it is very easy
The team won 104 games
160 * 0.65 = 104
Answer:
1
Step-by-step explanation:
Since they are not parallel nor the same line, they have 1 intersecting point, which is the solution.
If they were parallel, they would have no solution.
If they were the same line, they would have infinite solutions.
