Question

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Answer 1

@Vocaloid

Answer 2

A and c

Answer 3

are the statements at the end supposed to be equal signs?

sin^2(x) + cos^2(x) = 1?

Answer 4

oh yes

Answer 5

=1

Answer 6

then yes, I agree

Answer 7

just a and c?

Answer 8

yes

Answer 9

A and C

Answer 10

D

Answer 11

there should only be two solutions

solving for cos^2(2x) gives us

cos(2x) = 1/2

then figure out what angles on the UC give a cos value of 1/2 then divide the results by 2

Answer 12

c and d

Answer 13

good

Answer 14

wait a minute i forgot to consider the -1/2 solutions ugh

Answer 15

its ok

Answer 16

C

Answer 17

good

Answer 18

B

Answer 19

C

Answer 20

you there :)

Answer 21

still working on the calculations

I don't think pi/4 is a solution

using the sin difference rule I get

sin(3x-x) = 0 can you try solving this for x

Answer 22

pi/2

Answer 23

x=pi?

Answer 24

good

and there's only one choice that includes both pi/2 and pi, which one is it?

Answer 25

a

Answer 26

actually b?

Answer 27

note: we stated earlier that pi/4 is not a solution

Answer 28

so a

Answer 29

good

Answer 30

.

Answer 31

a

Answer 32

almost, 3pi/4 + 2pi*k is only one of the solutions;

solving for 2cos(x) + sqrt(2) = 0 gives cos(x) = -sqrt(2)/2 and there's one more value on the UC where cos(x) = -sqrt(2)/2

Answer 33

d

Answer 34

no b

Answer 35

right

Answer 36

well, is it 5pi/4 or 7pi/4 where cos(x) = -sqrt(2)/2?

Answer 37

d

Answer 38

good, D

Answer 39

its 5pi/4

Answer 40

A and c

Answer 41

almost

if you want to multiply the r-value by -1 you have to add pi to the angle not 2pi

Answer 42

d

Answer 43

so a and d

Answer 44

good, A+D

Answer 45

C

Answer 46

a= 200 and b = 134?

Answer 47

yes side a and b

Answer 48

angle B cannot be 141.92 degres because angle A is already 113 degrees

Answer 49

it would make the sum of the triangle > 180

Answer 50

so a

Answer 51

good

Answer 52

got to go to lunch pretty soon but you would just use law of cosines

Answer 53

ok

Answer 54

b^2 right

Answer 55

7.39?