= 4(1 - tg²x)/(ctg²x(1 + tg²x)(1 - tg⁴x)) + cos²2x = 4(1 - tg²x)/(ctg²x(1 + tg²x)²(1 - tg²x)) + cos²2x = 4/(ctg²x(1 + tg²x)²) + cos²2x = 4/(ctg²x(1/cos⁴x)) + cos²2x = 4/((cos²x/sin²x)·(1/cos⁴x)) + cos²2x = 4/(1/sin²x·cos²x) + cos²2x = 4sin²x·cos²x + cos²2x = sin²2x + cos²2x = 1
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= 4(1 - tg²x)/(ctg²x(1 + tg²x)(1 - tg⁴x)) + cos²2x = 4(1 - tg²x)/(ctg²x(1 + tg²x)²(1 - tg²x)) + cos²2x = 4/(ctg²x(1 + tg²x)²) + cos²2x = 4/(ctg²x(1/cos⁴x)) + cos²2x = 4/((cos²x/sin²x)·(1/cos⁴x)) + cos²2x = 4/(1/sin²x·cos²x) + cos²2x = 4sin²x·cos²x + cos²2x = sin²2x + cos²2x = 1