Rozwiąż rownanie :
2cos(3x- ) = -1
2cos(3x- ) = -1/:2
cos(3x- )= - ½
cos(3x- )= cos (π/2 +π/6)
cos(3x- )= cos (⁴/₆ π) z parzystosci i okresowosci cos
3x- = ⁴/₆ π +2kπ v 3x- = - ⁴/₆ π +2kπ ∈C
3x= ⁴/₆ π + ½ π +2kπ ∨ 3x= - ⁴/₆ π +½π +2kπ
3x= ⁷/₆ π +2kπ ∨ 3x= -¹/₆ π +2kπ /:3
x= ⁷/₁₈π+⅔kπ v x= -¹/₁₈π +⅔kπ
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2cos(3x- ) = -1/:2
cos(3x- )= - ½
cos(3x- )= cos (π/2 +π/6)
cos(3x- )= cos (⁴/₆ π) z parzystosci i okresowosci cos
3x- = ⁴/₆ π +2kπ v 3x- = - ⁴/₆ π +2kπ ∈C
3x= ⁴/₆ π + ½ π +2kπ ∨ 3x= - ⁴/₆ π +½π +2kπ
3x= ⁷/₆ π +2kπ ∨ 3x= -¹/₆ π +2kπ /:3
x= ⁷/₁₈π+⅔kπ v x= -¹/₁₈π +⅔kπ