Question

Simplify 1+cos(x+pi/2)+cos(x-pi/2)

Answer 1

1 + 2 cos x

Answer 2

Steps?

Answer 3

cos(a+b)=cos a cos b -sin a sin b
understand what I mean ?

Answer 4

Yes .

Answer 5

But if cos(pi/2) is 0 , then how come the answer is 1+2cosx?

Answer 6

hey erkoT

Answer 7

?

Answer 8

want to help me out with three questions??

Answer 9

If I have any idea on how to solve them , then sure .

Answer 10

Write the equation of the line that is parallel to the line y = -3x + 12 and passes through the point (-1, 6).
Answer

y = one third x + 7

y = -3x + 3

y = 'one third x + 3

y = -3x + 7

Answer 11

y = -3x + 3

Answer 12

if so ecaplin how u did it please

Answer 13

Write the equation of the line that is perpendicular to the line y = 2x + 2 and passes through the point (6, 3).
Answer

y = 2x + 6

y = -one half x + 3

y = -one half x + 6

y = 2x + 3

Answer 14

So basically the first thing you want to do is to find the ascent of the line , which is -3 from the formula , y=kx+b (Not sure how it's in your country) but from here you'll get that k or the ascent is -3 ,
Then use the formula y-y'=k(x-x') , so you'll get y-6=-3(x+1) -> y=-3x+3 .
Sorry for my typing speed .

Answer 15

oh its okay and thank u actually i get it for once.

Answer 16

i got one more after the one up there! Thats if u dont mind.. and where are you from?

Answer 17

y = -one half x + 6 , want me to explain too?

Answer 18

no

Answer 19

And i'm from Estonia .

Answer 20

Write the equation of the line that is parallel to the line 4x - 3y = -12 and passes through the point (-3, 4).
Answer

y = four thirds x + 8

y = four thirds x + 3

y = -three fourths x + 8

y = -three fourths x + 3

Answer 21

y = four thirds x + 8

Answer 22

where is that...europe?

Answer 23

Yes , you're correct .

Answer 24

and do u mins checking on for me?

Answer 25

Checking on?

Answer 26

Write the equation of the line that is perpendicular to the line 3x + y = 7 and passes through the point (6, -1).
Answer

y = one third x - 3

y = one third x + 17

y = -3x - 3

y = -3x + 17

this is a?

Answer 27

im pretty sure that this one is a ????

Answer 28

A

Answer 29

You're correct . Well done .

Answer 30

thanks so much

Answer 31

You're welcome .

Answer 32

i have more but its a little different and im sure ur tired and i know u helped me enough already!

Answer 33

i became ur fan!

Answer 34

Thank you ! We could also become friends .

Answer 35

?

Answer 36

how so?

Answer 37

But send me one of your problems you have left . I'll see how different is it . Well , Facebook for example .

Answer 38

ugh i dont have a fb

Answer 39

Which of the following is the slope between the points (0, -10)and (-4, 0)?

Answer 40

Im warring you that i have like 40 questions...

Answer 41

left to be answered and u can say no

Answer 42

?
u there

Answer 43

The slope or ascent as I told it before if calculateable with the formula . k=(y2-y1)/(x2-x1) . So just plug in the values k=(0-(-10))/(-4-0) , which is -2,5 .

Answer 44

Which of the following is the slope between the points (3, -2)and (8, 4)?
Answer

-five sixths

-six fifths

six fifths

five sixths

Answer 45

Yea , i'm still here . But i'm afraid I can't help you any more today cause I need to go . >But I'll help you wiht the last one .

Answer 46

ok and thanks.

Answer 47

k=(4-(-2))/(8-3)=6/5

Answer 48

thanks so much what time is it there???

Answer 49

13.04 or 1pm (not sure about the pm) .

Answer 50

LOL THANKS AGAIN byee (:

Answer 51

See you ! :)