²

  1. IV. .
  2. . . .
  3. , .
  4. . .
  5. .

sin 2x = 2sin x cos x

cos 2x = cos2x - sin2x = 2cos2x - 1 = 1 - 2sin2x

ֳ - , . , , ³ 4 2 .

1. .

. .

г:

2. .

1. .

г: . , .

= = = .

, .

1 = sin2150+ cos2150. , = =

= .


2. , .

г: . , . , cos x.x - IV , cos s> 0., ³: - 8. , I , IV . , - IV ( I sinx> 0)


3. .

г: : , .

= - 1,5 - 0,5 = - 2.

³: - 2.

:

1) , :

) ;

) 쳺 , ,

.

2) .

..



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