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\[\frac{ 2 }{x ^{2} }+\frac{ 5 }{ 2 }\]

what did u just wrote, it became error. all of a sudden

is that the equation

do you need to take the derivative

|dw:1384947669567:dw|

is the equation, right?

quotient rule

i get dy/dx = -4x^-3, after that what should i do?

or simplify it to 2x^(-2)

do you know point-slope form?

no

once you find the derivative that gives you the slope

the derivative is \[\frac{ 4 }{ x ^{3} }\]

plug in the x to get the slope

with a point (x1, y1) and a slope m
the equation of a line can be written (y-y1)=m(x-x1)

1/2 is m ?

yes

y-3=1/2(x-2)

distribute the 1/2 and then add the three

i got it!!! i have another question

solve the equation 3 cos 2x + 5 sinx =4 for 0

you have to simplify it first, use the identity for cos 2x

how to simplify that?

use the identity for cos 2x