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4cos(0,5x)=-4
cos(0,5x)=-1
0,5x=π+2kπ
x=2π+4kπ
b) 2sin3x = -√2
sin3x = -√2/2
3x=-π/4 + 2kπ lub 3x=-3π/4 + 2kπ
x=-π/12 + ⅔kπ lub x=-π/4 + ⅔kπ
c) tg (2x-π/8) = 1
2x-π/8=π/4 + kπ
2x=3π/8 + kπ
x=3π/16 + ½kπ
d) ctg (1/3x + π/3) = √3
1/3x + π/3 = π/6 + kπ
⅓x=-π/6 + kπ
x=-π/2 + 3kπ