document.write( "Question 665802: If cos(t)=-3/4 where pi\n" ); document.write( "Note: Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2).
\n" ); document.write( "cos(2t)=
\n" ); document.write( "sin(2t)=
\n" ); document.write( "cos(t/2)=
\n" ); document.write( "sin(t/2)=
\n" ); document.write( "I need HELP! Not even sure how to even start the problem. \n" ); document.write( "

Algebra.Com's Answer #414088 by Alan3354(69443) $\"\"$ $\"About$

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If cos(t)=-3/4 where pi\n" ); document.write( "Note: Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2).
\n" ); document.write( "cos(2t)=
\n" ); document.write( "sin(2t)=
\n" ); document.write( "cos(t/2)=
\n" ); document.write( "sin(t/2)=
\n" ); document.write( "===============
\n" ); document.write( "Look up \"half-angle formula\" on Wikipedia. It has the double angles also.
\n" ); document.write( " \n" ); document.write( "

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