Choose the expression with exactly one variable.

2a + b - 7

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a + 2

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a + b + c

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Solution

The correct option is B a + 2

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a > 0

A, B, C

△ A B C,

a tan A + 2 a tan B + 3 a tan C = 7 a,

{tan}^{2} A + {tan}^{2} B + {tan}^{2} C =

98 (a + b)^{2} - 2

From the sum of 7a – 2b + 11 and -2a -5, subtract 7a – b + 4.

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