Question

Help
http://prntscr.com/120ari
can you tell me if my answers are right

Answer 1

@jim_thompson5910

Answer 2

ok sry for taking so long, got distracted

# 1 and # 2 are correct

checking the others

Answer 3

the others are correct as well, nice work

Answer 4

other questions now

Answer 5

http://prntscr.com/120egd

Answer 6

# 5 is correct

Answer 7

for #6, you could say that each term is multiplied by -1/2 to get the next term

but you basically have it

Answer 8

the last term of 1/8 should be -1/8

Answer 9

http://prntscr.com/120f70

Answer 10

8pi/4 is 2pi

Answer 11

and the first line is known as the zeros or roots

Answer 12

it's not where theta is 0, its where the function is zero

Answer 13

oh and i should have seen this, but 2pi isn't a root

7pi/4 is a root (so you're slightly off a bit)

Answer 14

i just have to change the statetment

Answer 15

yeah and that last root

Answer 16

everything else is correct

Answer 17

http://prntscr.com/120fcd

Answer 18

8 is correct, even though it's probably a bit messy and it needs some parenthesis

Answer 19

you have the right idea though

Answer 20

and i'm not sure how you got #9, but it looks off

Answer 21

i skipped one of the step becuase it was making the answer look messsy like q8

Answer 22

http://prntscr.com/120gbp

Answer 23

sin(90-A) is NOT sin(A)

sin(90-A) is actually cos(A)

Answer 24

and cos 90-A is sin A

Answer 25

cos(90-A) should be sin(A)

Answer 26

yep

Answer 27

you'll get cos(A)/sin(A) = cot(A)

Answer 28

sorry mistyped

Answer 29

thats ok

Answer 30

http://prntscr.com/120h7o

Answer 31

both are correct, i would add in there that in general if a*b^x has b < 1, then you have exponential decay

but you don't have to since you pretty much got the correct answer

Answer 32

http://prntscr.com/120i5j
i need help with this one

Answer 33

cos(2x) = cos(x+x)

then use

cos(A+B) = cos(A)cos(B) - sin(A)sin(B)

Answer 34

oh and also use

sin^2(x) = 1-cos^2(x)

Answer 35

then

Answer 36

have supposed theta as x

Answer 37

i know, i used x because it's easier to type out

Answer 38

but the identities are still the same (replace every x with theta)

Answer 39

then?

Answer 40

what do you mean

Answer 41

sin^2(x) = 1-cos^2(x)

Answer 42

yes what about it?

Answer 43

is it where it ends