Решения к Сборнику заданий по высшей математике Кузнецова Л.А. - 2. Дифференцирование. Зад.8

Задача 8 . Найти производную.

8.1.

y'= 6 sin 3 xcos 3 xcos 6 x +3(1- cos 6 x ) sin6x = sin12x +2 sin6x - sin12x = tg6x _

3cos² 6x 3cos² 6x cos6x

8.2.

y'= 6cos3xsin3xsin6x+3(cos6x+1)cos6x = 3sin² 6x+3cos² 6x+3cos6x = 1+cos6x = 1+cos6x

6sin² 6x 6sin² 6x 2sin² 6x 1-cos12x

8.3.

y'= 8 sin4xcos4xcos8x +4(1- cos8x ) sin8x = 2 sin16x +4 sin8x -2 sin16x = tg8x _

4cos² 8x 4cos² 8x cos8x

8.4.

y'= 8cos4xsin4xsin8x+4(cos8x+1)cos8x = 4sin² 8x+4cos² 8x+4cos8x = 1+cos8x = 1+cos8x

8sin² 8x 8sin² 8x 2sin² 8x 1-cos16x

8.5.

y'= cossin5*4 sin2xcos2xcos2x +2(1- cos4x ) sin4x = cossin5*sin8x +2 sin4x - sin8x = cossin5*tg4x _

2cos² 4x 2cos² 4x cos4x

8.6.

y'= -sincos3*4cos2xsin2xsin4x+2(cos4x+1)cos4x =sincos3*2sin² 4x+2cos² 4x+2cos4x =sincos3*1+cos4x = sincos3*1+cos4x

4sin² 4x 4sin² 4x 2sin² 4x 1-cos8x

8.7.

y'=cosln7*14 sin7xcos7xcos14x +7(1- cos14x ) sin14x =cosln7*sin28x +2 sin14x - sin28x =cosln7* tg14x _

7cos² 14x 2cos² 14x cos14x

8.8.

y'= 16cos8xsin8xsin16x+8(cos16x+1)cos16x = 8sin² 16x+8cos² 16x+8cos16x =

16sin² 16x 16sin² 16x

= 1+cos16x = 1+cos16x

2sin² 16x 1-cos32x

8.9.

y'= 12 sin6xcos6xcos12x +6(1- cos12x ) sin12x = sin24x +2 sin12x - sin24x = tg12x _

6cos² 12x 2cos² 12x cos12x

8.10.

y'= 20cos10xsin10xsin20x+10(cos20x+1)cos20x =10sin² 20x+10cos² 20x+10cos20x =

20sin² 20x 20sin² 20x

= 1+cos20x = 1+cos20x

2sin² 20x 1-cos40x

8.11.

y'= 20 sin10xcos10xcos20x +10(1- cos20x ) sin20x =

10cos² 20x

= 5 sin40x +10 sin20x -5 sin40x = tg20x _

10cos² 20x cos20x

8.12.

y'= 24cos12xsin12xsin24x+12(cos24x+1)cos24x = 12sin² 24x+12cos² 24x+12cos24x =

24sin² 24x 24sin² 24x

= 1+cos24x = 1+cos24x

2sin² 24x 1-cos48x

8.13.

y'= 10 sin5xcos5xcos10x +5(1- cos10x ) sin10x =

5cos² 10x

= sin20x +2 sin10x - sin20x = tg10x _

2cos² 10x cos10x

8.14.

y'= -cosctg3*28cos14xsin14xsin28x+14(cos28x+1)cos28x = -cosctg3*14sin² 28x+14cos² 28x+14cos28x =

28sin² 28x 28sin² 28x

= -cosctg3*1+cos28x = -cosctg3*1+cosx

2sin² 28x 1-cos56x

8.15.

y'= costg1/3*30sin15xcos15xcos30x +15(1- cos30x ) sin30x =

15cos² 30x

= costg1/3*sin60x +2 sin30x - sin60x = costg1/3* tg30x _

2cos² 30x cos30x

8.16.

y'= - sintg1/7*32cos16xsin16xsin32x+16(cos32x+1)cos32x = - sintg1/7*16sin² 32x+16cos² 32x+16cos32x =

32sin² 32x 32sin² 32x

= - sintg1/7*1+cos32x = - sintg1/7*1+cos32x

2sin² 32x 1-cos64x

8.17.

y'= ctgsin1/3*34 sin17xcos17xcos34x +17(1- cos34x ) sin34x =

17cos² 34x

= ctgsin1/3*sin68x +2 sin34x - sin68x = ctgsin1/3* tg34x _

2cos² 34x cos34x

8.18.

y'= - ⁵ √ctg2*36cos18xsin18xsin36x+18(cos36x+1)cos36x = - ⁵ √ctg2*18sin² 36x+18cos² 36x+cos36x =

36sin² 36x 36sin² 36x

= - ⁵ √ctg2*1+cos36x = - ⁵ &#

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