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1)tg a*ctg a-sin^2a
2)ctg a/tg a + sin^2a+cos^2a
1)tg a*ctg a-sin^2a
2)ctg a/tg a + sin^2a+cos^2a
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1)tg a*ctg a-sin^2a = 1 - sin²a = cos²a
2)ctg a/tg a + sin^2a+cos^2a = 1 / tg²a + 1 = (1 + tg²a)/tg²a