Hi I am wondering about my answer..Given that cosA-sinA=1/3,find the exact value of cosAsinA. I got (2sqrt(5))/9 but the answer is 4/9.. Really appreciate this thanksa. Lot!!

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- Nov 25th 2012, 01:20 AMTutufinding.the.value.of a trigonometric ratio
Hi I am wondering about my answer..Given that cosA-sinA=1/3,find the exact value of cosAsinA. I got (2sqrt(5))/9 but the answer is 4/9.. Really appreciate this thanksa. Lot!!

- Nov 25th 2012, 01:28 AMMarkFLRe: finding.the.value.of a trigonometric ratio
Take the given relation and square it:

You should then find the given result, after you simplify and solve for the required expression. - Nov 25th 2012, 01:30 AMProve ItRe: finding.the.value.of a trigonometric ratio