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Mathematics 9 Online
OpenStudy (anonymous):

Find the exact value of sin (7pi/8)

OpenStudy (shamil98):

Consult the unit circle, or use a calculator.

OpenStudy (joannablackwelder):

I would use a reference angle and a double angle formula.

OpenStudy (joannablackwelder):

Sorry, half angle, not double angle formula.

OpenStudy (anonymous):

\[\sqrt{2-\sqrt{2}}/2\]

OpenStudy (anonymous):

is that right?

OpenStudy (joannablackwelder):

That's what I get. Great job!

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