Not clear what you mean since there is only one instance of sin involved.

In the instance of this question you have, in effect y=f(x), so you need the inverse function to get x, x = f^(-1) (y)

(edited 3 years ago)

Reply 24

shaun1702

4

Original post by ghostwalker

Not clear what you mean since there is only one instance of sin involved.

I mean : EXAMPLE vs/6=sin(2pift-pi/4) when moving the sin to the left hand side, so it would be: sin vs/6 =2pift-pi/4 to do this i divided the rhs by sin and not sin-1.

Reply 25

ghostwalker

17

Original post by shaun1702

I mean : EXAMPLE vs/6=sin(2pift-pi/4) when moving the sin to the left hand side, so it would be: sin vs/6 =2pift-pi/4 to do this i divided the rhs by sin and not sin-1.

There are no circumstances where you can do what you did there - just move the sin from the right to the left.

Sin is not a number that is being multiplied by "2pift-pi/4", so you cannot divide by sin.

Sin is a function which takes "2pift-pi/4" as its argument.

It's akin to saying y=f(x). You need to use the inverse function f^-1 and apply that to each side. So, f^-1 (y) = f^-1( f(x)) = x.

And the inverse of the sin function is the asin function.

Reply 26

shaun1702

4

Original post by ghostwalker

There are no circumstances where you can do what you did there - just move the sin from the right to the left.

Sin is not a number that is being multiplied by "2pift-pi/4", so you cannot divide by sin.

Sin is a function which takes "2pift-pi/4" as its argument.

It's akin to saying y=f(x). You need to use the inverse function f^-1 and apply that to each side. So, f^-1 (y) = f^-1( f(x)) = x.

And the inverse of the sin function is the asin function.

okay thanks for that.

will you please be able to help with another problem i have which is also on this site. https://www.thestudentroom.co.uk/showthread.php?t=6941250&p=94073792#post94073792

Reply 27

Jarrel

1

can you explain this please?why does f= 1e 6?

Reply 28

ghostwalker

17

Original post by Jarrel

can you explain this please?why does f= 1e 6?

1e6 is just notation for

1\times 10^6

, which is 1,000,000, or 1M (M for mega, SI abbreviation for a million)

Reply 29

xangodrums

1

hi, im currently stuck on the same question, could somebody please provide a breakdown of making 't' the subject in this equation?

equation reminder..... Vs = 6sin(2pift - (pi/4))

any help with this will be massively appreciated.

Reply 30

ghostwalker

17

Original post by xangodrums

hi, im currently stuck on the same question, could somebody please provide a breakdown of making 't' the subject in this equation?

equation reminder..... Vs = 6sin(2pift - (pi/4))

any help with this will be massively appreciated.

Fully worked solutions are against the forum rules - see "**Posting Guidelines**"; sticky thread at top of forum.

One method, to get you started: Begin with t; then what steps are required, in order, to get you to Vs? Now reverse the process, start with Vs, then invert the last step, then the next, etc., until you end up with t.

Post further, with working, if you get stuck.

Reply 31

BartyRB

1

Hi Guys,

I know tis was posted a while back, don't suppose you can show me the actual formula so I can compare with what I've got. I've got the answer but I don't think I've laid out the answer properly

Reply 32

mqb2766

21

Original post by BartyRB

Hi Guys,

I know tis was posted a while back, don't suppose you can show me the actual formula so I can compare with what I've got. I've got the answer but I don't think I've laid out the answer properly

What did you get?

Reply 33

Feay1

1

Hi there I am also struggling with this one.In the reply your method is this..One method, to get you started: Begin with t; then what steps are required, in order, to get you to Vs? Now reverse the process, start with Vs, then invert the last step, then the next, etc., until you end up with t.However the beginning with t makes sense then you said reverse the process start with Vs then invert the last step. do you mean inverse everything from t again? Would you mind making slightly more clear?Cheers!

Reply 34

lewis1608

1

Original post by mqb2766

Yes, that's correct.
I was going to mention the lack of brackets on both the numerator and denominator in the OP, but decided not to be picky :-). Putting them in is a good habit to get into and checking rad mode .