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In a A B C , if r1+r3+r=r2, then sec^2A...

In a ` A B C ,` if `r_1+r_3+r=r_2,` then `sec^2A+cos e c^2B' is equal to `1-cos^2C` (2) `1+cos e c^2C` (4) `2-cot^2C`

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