Question

Please help me evaluate!

tan(sin^-1(-5/9))

Answer 1

Trigonometric Functions

Answer 2

what would i do to find tan(x)??

Answer 3

is there a formula?

Answer 4

To find AB use pythagoras

Answer 5

but how can i find anything without A and B having any numbers to enter into a formula?

Answer 6

Let sin^-1(-5/9) = x
sin(x) = -5/9
tan(x) = opposite / adjacent = AC / AB = 5 / AB.
AB can be found from AB^2 + AC^2 = AC^2

Answer 7

Or tan(x) = sin(x)/cos(x)
But u still have to find adjacent for it

Answer 8

I meant Pythagoras theorem u can't use PYTHOGARAS because he is already dead
I know it was a lame joke

Answer 9

lol okay so i now know that i need to do ab^2 + ac^2 = ac^2 but how do i get the numbers? :(

Answer 10

AC = 5, BC = 9 (see the diagram).

Answer 11

In a Right-angled triangle ,
Sum of the squares of two sides = the square of the hyptenuse

Answer 12

It should be AB^2 + AC^2 = BC^2

Answer 13

SOH CAH TOA

Answer 14

I got 10.3

Answer 15

You wrote the formula incorrectly

Answer 16

am i wrong :O

Answer 17

i meant ali

Answer 18

I will have to check

Answer 19

okay because if i am right I'm still not sure what to do after lol

Answer 20

Are u screwed with your basics

Answer 21

AB^2 = 9^2 - 5^2.
AB = ?

Answer 22

https://www.khanacademy.org/

Answer 23

well I'm doing an online class with no textbook or teacher so what i do know i either taught myself or learned from youtube and math isn't my best subject, so i guess so

Answer 24

no problem but don't jump the gun then u won't understand future concepts if you are not knowing the fundamentals

Answer 25

ranga, i got 2sqrt14

Answer 26

Find AB. Find tan(x). Stick a negative sign in front of it because inverse sine of -5/9 is a negative angle and is in the fourth quadrant where tan is negative.

Answer 27

oh wow, i see what happened there!

Answer 28

Yes, AB = 2sqrt(14).
tan(x) = AC/AB = - 5 / (2sqrt(14))

Answer 29

Alright.

Answer 30

would the answer be -5sqrt14/28? because i have to multiply by sqrt 14

Answer 31

Yes. Most teachers and textbooks don't like a radical in the denominator and so you will have to rationalize the denominator by multiplying top and bottom by sqrt(14).
You will get -5sqrt(14) / 28.

Answer 32

awesome, thank you so much!! :)

Answer 33

You are welcome.