Question

trig help

Answer 1

@Vocaloid

Answer 2

so a ?

Answer 3

You can use the identity \[ \sin ( \theta ) = \cos ( \pi/2 - \theta ) \]Then plug in \[
\sin ( 4 \pi /3 ) = \cos ( \pi/2 - 4 \pi/3) = \cos( - 5 \pi/6) \]
And then use the fact that $$ \cos ( -\theta) = \cos \theta $$

Answer 4

@moreso I'm confused on what question you are solving for?

Answer 5

number 2.

Answer 6

is 2 a?

Answer 7

I don't want to give out a direct answer.

Answer 8

because of identity

Answer 9

what about 3

Answer 10

my notes says tan is positive in 3

Answer 11

whoops, i mean tan and cos are negative in quadrant 2

Answer 12

students sin positive quad 2
all all positive quad 1
take tan positive quad 3
calculus cos positive quad 4

Answer 13

which of those angles is a quadrant 2 angle

Answer 14

so 110 would be answer right/

Answer 15

yep based on unit circle

Answer 16

"all students take calculus "
^ i like that

Answer 17

made 100 on practice yay

Answer 18

good job ;p

Answer 19

@moreso

Answer 20

@Shadow

Answer 21

c?

Answer 22

Try Pythagorean theorem to find the third side

Answer 23

Then use the reference angle.

Answer 24

$$ \tan \theta = \tan ( \theta ~') $$

Answer 25

|

Answer 26

b duh i did hypotenuse instead of opposite and adjacent oops

Answer 27

;p

Answer 28

4?

Answer 29

thats one of them, cos is also positive in which quadrant

Answer 30

1 because of all

Answer 31

yep

Answer 32

omg ty 100 again

Answer 33

:)