document.write( "Question 952022: (a) Solve the equation on the given interval, expressing the solution for x in terms of inverse trigonometric functions. (Enter your answers as a comma-separated list.)
\n" ); document.write( "10(cos x)^2 − cos x − 9 = 0 on [π/2, π]\r
\n" ); document.write( "\n" ); document.write( "Answer: x = \r
\n" ); document.write( "\n" ); document.write( "(b) Use a calculator to approximate the solution in part (a) to three decimal places. (Enter your answers as a comma-separated list.)\r
\n" ); document.write( "\n" ); document.write( "Answer: x = \n" ); document.write( "

Algebra.Com's Answer #581439 by lwsshak3(11628) $\"\"$ $\"About$

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(a) Solve the equation on the given interval, expressing the solution for x in terms of inverse trigonometric functions. (Enter your answers as a comma-separated list.)
\n" ); document.write( "10(cos x)^2 − cos x − 9 = 0 on [π/2, π]
\n" ); document.write( "10cos^2(x)-cosx-9=0
\n" ); document.write( "(10cosx+9)(cosx-1)
\n" ); document.write( "10cosx+9=0
\n" ); document.write( "cosx=-9/10
\n" ); document.write( "x≈2.690
\n" ); document.write( "cosx-1=0
\n" ); document.write( "cosx=1
\n" ); document.write( "no solution, not in given domain
\n" ); document.write( "Answer: x ≈2.690 radians
\n" ); document.write( "(b) Use a calculator to approximate the solution in part (a) to three decimal places. (Enter your answers as a comma-separated list.)
\n" ); document.write( "Answer: x =2.690 radians \n" ); document.write( "

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