Inv. Trig Function

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January 26th 2009, 01:00 AM
ADY

Inv. Trig Function

If you want to find a value for X from which

$sin^-1(x) = 0.8$

I have graphed this, and is $X = .916$

Any help please
January 26th 2009, 02:01 AM
mr fantastic

Quote:

Originally Posted by ADY

If you want to find a value for X from which

$sin^-1(x) = 0.8$

I have graphed this, and is $X = .916$

Any help please

Your post makes no sense.

If you want to solve $\sin^{-1}x = 0.8 \Rightarrow x = \sin 0.8$ then use a calculator. I get x = 0.717 (correct to 3 decimal places) assuming you're measuring angle in radians.

Otherwise, please post the question exctaly as it appears in your book or wherever it is you got it from.
January 26th 2009, 02:49 AM
ADY

Apologises Mr F.

I was just clearly mashing the keypad lol.

Ok, so lets try again.

Explain how i can use the inv. trig functions on my calc to find a value of X. From $sin(X) = 0.8$

Thanks
January 26th 2009, 02:54 AM
mr fantastic

Quote:

Originally Posted by ADY

Apologises Mr F.

I was just clearly mashing the keypad lol.

Ok, so lets try again.

Explain how i can use the inv. trig functions on my calc to find a value of X. From $sin(X) = 0.8$

Thanks

$\sin x = 0.8 \Rightarrow x = \sin^{-1} (0.8) = 0.927$ radians.

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