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OpenStudy (anonymous):
Find the exact value of cos(195 degrees)
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OpenStudy (anonymous):
I reckon your calculator could do that for you...
OpenStudy (anonymous):
i kn but we have to do it without a calculator
OpenStudy (mathstudent55):
\( \cos 195^o = \cos (150^o + 45^o)\) Use the angle addition identity.
OpenStudy (mathstudent55):
The calculator won't give an exact answer.
OpenStudy (kropot72):
You will find how to calculate the exact value at the following link: http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/simpleTrig.html#1575
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