Question

If sin y = a/6 and tan y = a/b what is the value of cos y?

Answer 1

answer choices:
cos y = 6/b

cos y = 6a

cos y = 6b

cos y = b/6

Answer 2

Use tanx = sinx/cosx

Answer 3

can you rearrange Christos's forumla for cosx @kaylakitty?

Answer 4

I'm still confused, I know that cos = adjacent/hypotenuse, and I know how to find cos but I don't get this question

Answer 5

Well first of all on this question you are not gonna use cos = adjacent/hypotenuse

STEP 1: tan y = sin y/cos y
STEP 2: tan y/sin y = 1/cos y
STEP 3: replace tan, sin, and cos with the values you already got

Can you do this for starters?

Answer 6

Correction STEP 3: Just replace tan and sin

Answer 7

I'm still confused :/

Answer 8

About what exactly?

Answer 9

I know how to solve for tan, sin, and cos when it's on a triangle with the degrees, like this question just confuses me, idk

Answer 10

Do you know how to solve this x*6 -3 = 3 ? What's the value of x?

Answer 11

yes, it's 1

Answer 12

x=1*

Answer 13

\[\boxed{\sin\theta=\tfrac{\text{opposite side}}{\text{hypotenuse}}},\qquad\boxed{\cos\theta=\tfrac{\text{adjacent side}}{\text{hypotenuse}}},\qquad\boxed{\tan\theta=\tfrac{\text{opposite side}}{\text{adjacent side}}}\]

\[\frac{\sin\theta}{\cos\theta}=\frac{\tfrac{\text{opposite side}}{\text{hypotenuse}}}{\tfrac{\text{adjacent side}}{\text{hypotenuse}}}=\frac{\tfrac{\text{opposite side}}{\color{red}{\cancel{\color{black}{\text{hypotenuse}}}}}}{\tfrac{\text{adjacent side}}{\color{red}{\cancel{\color{black}{\text{hypotenuse}}}}}}=\frac{\text{opposite side}}{\text{adjacent side}}=\tan\theta\]

Answer 14

Correct. Back to my STEP 3.

tan y/sin y = 1/cos y -----> (a/b)/(a/6)= 1/cosy

What's the value of cosy?

Answer 15

b=6cos(y) so cos y = 6b?

Answer 16

No but, pretty close.

Answer 17

its cos(y) = b/6 (4th choice)

when you change sides of the coefficient (6) , the coefficient, becomes goes in the place of the denominator it is no longer a multiplication.

Answer 18

goes in the place*

Answer 19

Oh, okay I get it, thank you (:

Answer 20

Np