Inv. Trig Function

**ADY** · January 26th 2009, 01:00 AM

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

**mr fantastic** · January 26th 2009, 02:01 AM

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.

**ADY** · January 26th 2009, 02:49 AM

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

**mr fantastic** · January 26th 2009, 02:54 AM

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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