document.write( "Question 813098: Find the set of values of x (in radians) for which cos(x) = −1/sqrt(2), for x in [−2π, 0]. \n" ); document.write( "

Algebra.Com's Answer #489500 by lwsshak3(11628) $\"\"$ $\"About$

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Find the set of values of x (in radians) for which cos(x) = −1/sqrt(2), for x in [−2π, 0].
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\n" ); document.write( "cosx=-1/√2=-√2/2
\n" ); document.write( "reference angle x in quadrants II and III where cos<0
\n" ); document.write( "x=-3π/4,-5π/4
\n" ); document.write( "note: cos is an even function,ie,cos(x)=cos(-x) \n" ); document.write( "

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