Need Some more Math Help(new problems added)

JLRedWing13

so why isnt the third answer right on 5a? there has to be an answer to the second part of the equation

cos x = -2 doesn't have a solution.

and how did you get 3pi/2 for b?

If pi/2 is a solution, 3pi/2 has to be as well in this case.

for 6, exactly how did you put it into the calculator?

Well there are a couple ways you can do it. You can either graph y = cos(x) - (2/5) in your calculator and solve for the zeros using the calculator or graph y = cos(x) and y = 2/5 and find the intersection of the two graphs using the calculator. I don't know what kind of graphing calculator you have so I can't say for sure but you should be able to do that.

ZmbieFlavrdCupcakes

nvm
i had it in degree mode

JLRedWing13

For 8:

cos (arccos x + arcsin x) = cos(arccos x) cos(arcsin x) - sin(arccos x) sin(arcsin x)

cos(arccos x) and sin(arcsin x) both equal x and cos(arcsin x) = sin(arccos x) = sqrt(1 - x^2)

So it comes to x*sqrt(1-x^2) - x*sqrt(1-x^2) = 0.

I could be wrong but I've double checked by entering some values for x and the answer always comes out 0.....

ZmbieFlavrdCupcakes

sorry but i completely do not get that nor can decipher how to write it down

ZmbieFlavrdCupcakes

oh wait
its the double angle formula
i get it up until you said x equals something

JLRedWing13

So you see how I got the first line?

For the second line......cos(arccos(x)) = x and sin(arcsin(x)) = x.
and

That's how I got the other relation.

ZmbieFlavrdCupcakes

so basically, i end up with this written down?

x sqrt(1-x^2) - x sqrt(1-x^2)? and thats the answer? wouldnt the be 0?

JLRedWing13

That's what I'm saying......lol.

ZmbieFlavrdCupcakes

so its....right?

JLRedWing13

I'm pretty sure that's what it is. You can try graphing it on a calculator but I'm pretty sure it comes out 0......

ZmbieFlavrdCupcakes

yea it does
thanks Jay
i hope i get a 100%

JLRedWing13

You're welcome....I hope so too. lol

Adam

2-x over x-3 + 5 over x-1 =1

x^4-29x^2+100=0

2x=√5x+24+3
This one can be sloved by any of the three methods
Square root property
completing the square
quadratic formula

FLAT

E = 1.65 √(17/30 x 13/30) + √(14/30 x 16/30) =
√30 √30



can someone do this for me please i don't have a graphing calculator. there should be division signs above the 30's and it all is under one square root.


edit: wow each 30 should be in one denominator

FLAT

bump

JLRedWing13

I cannot even read that lol.

FLAT

fucking hell

ZmbieFlavrdCupcakes

bump for precalc review
i forgot everything and i feel dumb

simplify each

((X+3)/3)
1- (9/x^2)

(1/x)+(1/(x+2))
(x+1)/(x+2)

(1/(t+1))-(1/(t+2))
1-(1/(t+2))

(x-1)/(x+2)
1/(x-2)
MULTIPLIED BY
2+x
x-1

ZmbieFlavrdCupcakes

ok i got all of those except the second to last one
help please

Jayyyyyyyyyy

JLRedWing13

Express all of the terms with a common denominator.....in this case it would be (t+2)*(t+1).