show that f(x)=cos(x) is even and what is its graphical property
If the function is even, f(x) = f(-x).cos(-x) is the same value as cos(+x) therefore the function is even. Its graphical property is that it is symmetrical about the y axis as all even functions are.
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All answers ▸Solve these simultaneous equations: 2x+y-5=0 and x^2-y^2=3
Solve the pair of simultaneous equations; (1) y + 4x + 1 = 0, (2) y^2 + 5x^2 + 2x = 0 .
