document.write( "Question 703483: Refer to the graph of y = sin x or y = cos x to find the exact values of x in the interval [0, 4π] that satisfy the equation.
\n" ); document.write( "Problem: sin x = -1 \n" ); document.write( "

Algebra.Com's Answer #433547 by KMST(5328) $\"\"$ $\"About$

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Here are the graphs of $\"y=sin%28x%29\"$ and $\"y=-1%29%29%29from+%7B%7B%7B-pi%2F2\"$ to $\"9%2Api%2F2=about+14.3\"$ .
\n" ); document.write( " $\"graph%28300%2C100%2C-pi%2F2%2C+9%2Api%2F2%2C-1.5%2C1.5%2Csin%28x%29%2C-1%29\"$
\n" ); document.write( "You can see that $\"y=sin%28x%29=-1\"$ twice in that interval.
\n" ); document.write( "It happens for $\"x=highlight%283pi%2F2%29\"$ ( $\"270%5Eo\"$ or $\"3%2F4\"$ of a counterclockwise turn).
\n" ); document.write( "It happens again $\"2pi\"$ (a full turn) later,
\n" ); document.write( "at $\"x=2pi%2B3pi%2F2=highlight%287pi%2F2%29\"$ . \n" ); document.write( "

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