cos(sin^-1 3/5) im not certain how to start solving this problem. any help would be appreciated. thanks(Thinking)

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- Mar 17th 2013, 03:29 PMengineeronedayfind the exact value
cos(sin^-1 3/5) im not certain how to start solving this problem. any help would be appreciated. thanks(Thinking)

- Mar 17th 2013, 03:35 PMzhandeleRe: find the exact value
Try a reference triangle. If you don't know what I mean, write back, I'll explain it more.

The basic idea is to draw a triangle with an angle of which the sine is 3/5. Then figure out what the cosine of that angle must be. - Mar 17th 2013, 04:05 PMengineeronedayRe: find the exact value
thanks so much

so the ref triangle would tell me that the cos is 4/5? Its silly that was so easy. thanks again - Mar 17th 2013, 04:14 PMzhandeleRe: find the exact value
Yes. Keep that reference triangle in mind, it's often useful, in integration for example.