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(senx + cscx)² = sen²x + cot²x + 3 (aplicas productos notables
(a + b)² = a² + 2ab + b²
sen²x + 2senxcscx + csc²x = sen²x+ cot²x + 3 (csc²x = 1 +cot²x por
identidad fundament.)
sen²x + 2senxcscx + 1 + cot²x = sen²x + cot²x + 3 (cscx = 1/senx)
sen²x + 2senx * 1/senx + 1 + cot²x = sen²x + cot²x + 3
sen²x + 2 (senx/senx) + 1 + cot²x = sen²x + cot²x + 3
sen²x + 2(1) + 1 + cot²x = sen²x + cot²x + 3
sen²x + cot²x + 3 = sen²x+ cot²x + 3