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6. If tan a = - and tan B = , then cos 2...

6. If tan a = - and tan B = , then cos 2a is equal to 1) sin 2B 2) sin 4B 3) sin 3B 4) cos 2B 7. If tan 0 = f, then bcos 2e+a sin 20 is equal to 1)a 2) 3) 4) none le

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