Question

cos^-1 (3/8) or arccos 3/8

Answer 1

they are the same thing

Answer 2

any answers u got

Answer 3

yes i know they are the same thing, some people only reconize one way. i understand how to input into a calculator, but the teacher ask us to show work.

Answer 4

i know the answer is 1.19, but i need to show work on paper

Answer 5

@acal21 , you only came to say its the same problem? i assume you dont know how to show work for it either!

Answer 6

@ozzy22 , can you show me how to work out the problem with no calculator?

Answer 7

this is actually an angle difference formula for tan problem

tan (A - B) = (tan A - tan B) / (1 + tan A tan B)

A = cos^-1 (-3/5) ==> x = -3 and r = 5; therefore, y = 4 (from x^2 + y^2 = r^2)
tan A = -4/3

B = arcsin (8/17) ==> y = 8, r = 17, and x = 15 (again, from x^2 + y^2 = r^2)
tan B = 8/15

plugging into formula: tan (A - B) = (-4/3 - 8/15) / (1 + (-4/3)(8/15))

tan (A - B) = (-20/15 - 8/15) / (1 - 32/45)
tan (A - B) = (-28/15) / (13/45) = (-28/15) * (45/13) = (-3*28) / 13 = -84/13

tan (A - B) = -84/13

Answer 8

@ozzy22 so what do you have as the final answer?

Answer 9

-84/13?

Answer 10

yes

Answer 11

the correct answr for this problem is 1.19

Answer 12

how did u get that answer
POST

Answer 13

my book has the answers to the odd problems, it only shows the key strokes for the solution, do you want that?

Answer 14

yes pls

Answer 15

one moment, have to take pic with phone,email to laptop then upload here

Answer 16

K NP

Answer 17

@ozzy22

Answer 18

1.20 rounded in two places

Answer 19

idk man, im completely lost on this problem

Answer 20

oh round to 2 decimal places in instructions

Answer 21

yes

Answer 22

sorry about the first answer

Answer 23

no problem, im not dwelling on mistakes. just looking for a way to show work for this on paper

Answer 24

\[3\div8=1.199 \]

Answer 25

with cos-1

Answer 26

then round .199 witch