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OpenStudy (anonymous):
Find the exact value of sin 9π/4. Is my working correct? 9π/4 = 8π/4 + π/4 = 2π + π/4 angle is in the 1st quadrant, and sinθ is positive in the 1st quadrant ∴ sin 9π/4 = sin (2π + π/4) = sin π/4 = 1/√2
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OpenStudy (marco26):
That's right. Though you might want to rationalize the denominator for simplification.
OpenStudy (anonymous):
will do, thanks
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