+ 2 = \boxed{9}
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- + 2 + \sec^2 x + \csc^2 x + 2 = 5 + \sec^2 x + \csc^2 x
- + (1 + \tan^2 x) + (1 + \cot^2 x) = 7 + \tan^2 x + \cot^2 x
- + 2y^2 = 2 \Rightarrow y^2 = 1 \Rightarrow y = \pm1 \Rightarrow z = \pm1
- $ 5a \cdot 2a = 10a^2 $,
- $ 5a \cdot 7b = 35ab $,
