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4. Find the exact value of cos(a - ), given that tana = -3/4 and tan B = 4/3, with a in quadrant II and

4. Find the exact value of cos(a - ), given that tana = -3/4 and tan B = 4/3, with a in quadrant II and 3 in quadrant III. 5. Find the value of sin(arctan 1 + arctan 2)

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