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Use the angle sum identities to find the exact value of trigonometric expression. Show...
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we know that;
`sin(180+theta) = -sintheta`
`sin(255) = sin(180+75) = -sin75`
`sin75 = sin(45+30)`
We know that;
`sin(A+B) = sinAcosB+cosAsinB`
So finally the answer is;
`sin(255) = sin(180+75) = -sin75 = -(sqrt3+1)/(2sqrt2) = 9659`
Posted by jeew-m on May 30, 2013 at 12:30 PM (Answer #1)
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