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OpenStudy (anonymous):
Find the exact value of sin(a+b):
If sina=3/5, 0< a< pi/2; cos B= 2 root 5/5, =pi/2
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OpenStudy (butterflydreamer):
hmm.. sin ( a+ b) = sina cosb + sinb cosa We are given: sina = 3/5 , cos b = 2 root 5/5 So draw out two triangles: |dw:1433425889828:dw|
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