sinL x cosL(tgL + ctgL)=
sinL x cosL x tgL + sinL x cosL x ctgL =
sinL x cosL x sinL / cosL + sinl x cosL x cosL / sinL =
sinL x sinL + cosL x cosL =
sin²L + cos²L = 1
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sinL x cosL(tgL + ctgL)=
sinL x cosL x tgL + sinL x cosL x ctgL =
sinL x cosL x sinL / cosL + sinl x cosL x cosL / sinL =
sinL x sinL + cosL x cosL =
sin²L + cos²L = 1