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∑ r=1 11 Tan 2 (r π/24) = a ; ∑ r=1 11 (-1) r-1 Tan 2 (r π/24) = b. Find a-2b and 2a-b

r=111 Tan2(r π/24) = a ; ∑r=111 (-1)r-1 Tan2(r π/24) = b. Find a-2b and 2a-b 

Grade:11

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