(sin^2 a+tg^2 a sin^2 a) ctg
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(sin²a+tg²a * sin²a)*ctg
sin²a(1+tg²a)*ctg
sin²a(1/cos²a)*ctg
sin²a*cosa/cos²a*sina
sina/cosa
tga
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(sin²a+tg²a * sin²a)*ctg
sin²a(1+tg²a)*ctg
sin²a(1/cos²a)*ctg
sin²a*cosa/cos²a*sina
sina/cosa
tga