Question about Texas Instruments TI-84 Plus Calculator

Wrong answer produced in sin / cos problems?

5sin(x)+1 = 0 should equal about 3.343 or 4.365, but my calculator gives me an answer of -11.537...

I know that I am doing all of the steps right...

5sin(x) = -1
-----------------
5

sin^(-1) (-.2) should not equal -11.537. whats wrong with my calculator?

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5sin(x)+1 = 0 is the equation you want to solve?
so
5sin(x) = -1
sin(x) = -(1/5)
arcsin( sin(x) ) = arcsin( -(1/5) )
x = -11.5369 (degrees)

Posted on Jun 04, 2010

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If my last instructions did not work then you need to reset your RAM. You are missing the negative sign and, I have no idea where you got the absolute value inside the brackets.
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