1. tan (x+x) 2. = tan(x) + tan (x)/1 - tan(x)tan(x) 3. = 2tan(x)/1-tan^2 (x)
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If it's a right triangle, and is also an isosceles triangle, namely two sides are of equal length, that means the other non-right-angles are 45° each, so the triangle is a 45-45-90 triangle, and thus we can apply the 45-45-90 rule, so let's do so. Check the picture below.
