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(2- )

sin(x), cos(x) vv . v , [-1,1] .

v - f(x+a) = f(x) f v . a - f v .

v v . V 2 .

sin(x), cos(x) vv .

vv , v : cos(x), sin(x) vv 0 . v!

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vvv. ( .) v . . ( . sec, tan, csc, cot vv .)

sin(x), cos(x), tan(x) vv vv . vv .. .

sin(x) - [-/2,/2] , [-1, 1] arcsin(x) .
cos(x) - [0,] , [-1, 1] arccos(x) .
tan(x) - (-/2,/2) , (-, ) arctan(x) .

v. , .

sec(x), csc(x), cot(x) vv v vv.

cos2(x) + sin2(x) = 1 . ( 人 ) . , .

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arccos(x) vv .

cos2(a) + sin2(a) = 1 cos2(a) - tan2(a) + 1 = sec2(a) .

.

<-- (1) | vv | (3)-->


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