# Thread: trig function - quickie

1. ## trig function - quickie

Hey, could someone v. quickly go thru the calculator process of solving

h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

I've got 5.61, as im creating a table, just wanna check im doing it right....thnks

2. Originally Posted by bobbymellor
Hey, could someone v. quickly go thru the calculator process of solving

h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

I've got 5.61, as im creating a table, just wanna check im doing it right....thnks
This value is wrong. Your calculator is currently in degree mode. It should be in RADIAN mode.

3. now i get 31.5, is that right??

4. Originally Posted by bobbymellor
now i get 31.5, is that right??
No. You should realise that this answer is absolutely impossible since sine is always between -1 and 1.

The answer is 9.5. I have no idea what you're doing wrong. Are you using brackets appropriately.

5. ok .....could you please show me how to do it on a calculator...i don't know what im doing wrong either

6. Originally Posted by bobbymellor
ok .....could you please show me how to do it on a calculator...i don't know what im doing wrong either
h = 5 + 4.5 sin ((Pi x t)/2) when t = 5

Get sin (5 Pi/2).

Multiply the answer by 4.5.