Question

I am 14 years old and I couldn't solve this trigonometry question, if tan2x=3/4 then what is the value of sinx?

Answer 1

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

Answer 2

Tan 2x = 3/4 = .75
2x = arc tan(.75) = 36.87 degrees
x= 36.87/2 = 18.44 degree
sinx= sin 18.44 = 0.31622 use calculator

Answer 3

did u get the process of doing it korcan?

Answer 4

well thanky you , but I found the answer as sinx= 1/3√5, and whats the meaning of arc?

Answer 5

I don2T know if my answer is true.

Answer 6

14yrs old?

Answer 7

that makes you like yr9 , this is a yr11/12 question

Answer 8

mark o. you did it wrong , they want an exact value for it

Answer 9

you need to use double angle expansion

Answer 10

YEa i am 14 years old and i learned trgionometry and function when i was 12 ^^

Answer 11

\[\tan(2x) = \frac{2\tan(x)}{1-\tan^2(x)} \]

Answer 12

mhmh just have a look at my answer mybe?

Answer 13

and check it please?

Answer 14

well u need to put the answer right awy so that we know tht u want to arrive at the answer w/c is 1/3sqrt5.....lol

Answer 15

1/(3sqrt5) = 0.316227766 using a calculator... does your teacher allow you to use calculator? ...lol...

Answer 16

you need to use a scientific calculator in order to solve trig, sometimes calculator serves you to check if your answer is correct....

Answer 17

im sure you can use a table of trig fuctions?..lol

Answer 18

arctangent is like this:

tan(36.87deg)=3/4 now the reverse of it is....

36.87deg=arc tan(3/4)

or arc tan(3/4) = 36.87deg

Answer 19

did you get it korcan?

Answer 20

you can ask question if you are not sure so that we can explain to you better..lol

Answer 21

OKA i got it thank you ^^but my teacher doesn2T let me use calculater, :( or table of trig fuctions :( but i know how to use it ^^

Answer 22

and i also dun have a calculator at hause xd ^^ and dun have calculator on p ctoo but i can program a calculator when i need ^^