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a^2 - b^2 = (a - b)(a + b)
(cos(30) - cos(45))(cos(30) + cos(45)) = [cos(30)]^2 - [cos(45)]^2
cos(30) = pierwiastek(3)/2
cos(45) = pierwiastek(2)/2
[cos(30)]^2 - [cos(45)]^2 = [pierwiastek(3)/2]^2 - [pierwiastek(2)/2]^2 = 3/4 - 2/4 = 1/4 = 0,25
(0,8660)²-(0,7071)²=0,7499-0,4999=0,25