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Ko iegūst, ja vienādojumā ctg 2 x = 5 ctgx - 6 izmanto substitūciju ctgx = a...

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Ko iegūst, ja vienādojumā ctg² x = 5 ctgx - 6 izmanto substitūciju ctgx = a?

a² + 5a + 6 = 0

50%

a² + 5a - 6 = 0

❌

a² - 5a + 6 = 0

a² - 5a - 6 = 0

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