document.write( "Question 1201684: simplify tan^2\theta \x cos^2\theta -sin^2\theta \n" ); document.write( "
Algebra.Com's Answer #836165 by math_tutor2020(3817)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"tan%5E2%28theta%29+%2A+cos%5E2%28theta%29+-+sin%5E2%28theta%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"sin%5E2%28theta%29+-+sin%5E2%28theta%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"0\"\r
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\n" ); document.write( "\n" ); document.write( "Therefore,
\n" ); document.write( "\"tan%5E2%28theta%29+%2A+cos%5E2%28theta%29+-+sin%5E2%28theta%29+=+0\"
\n" ); document.write( "is a trig identity.
\n" ); document.write( "It is true for all valid theta values in the domain.
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