∑ 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

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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

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

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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

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