vv
vv

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vv . ( vv .) vv, .

A=r2, C=2r (r ) 2, .

v /2 . :

.

/2 v . v . x2+y2=1

.

㺺 [x, 1] vv . , T(x) -

. , vv :

. T(x) [-1, 1] .

.

0 cos x


/2 P = (cos x, sin x) cos(x), sin(x) . ( v.)

sin(x), cos(x) [0, ] . v :

[, 2]

sin x = - sin(2 - x)
cos x = cos(2 - x)

. vv v vv ( v .) , ' [0, 2]

sin x = sin x'
cos x = cos x'

. sin(x), cos(x) v .

㺺v . sin'(x) = cos(x), cos'(x) = - sin(x) . .

28

sin'(x) = cos(x)
cos'(x) = - sin(x)

B = 2T . (cos x) = x/2 B(cos x) = x . cos B - .

,

.

.

<-- | vv | (2)-->


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