San yil Sinf: 9-sinf Fan

Darsning borishi:

I variant

1. Ifodani soddalashtiring : sin( sin(

2. Ifodani soddalashtiring:  .

3. Ifodaning shaklini almashtiring: .

4. Ayniyatni isbotlang:  .

5. cos va α – III chorakda bo’lsa, sin2α va cos2α ni toping.

II variant

1. Ifodani soddalashtiring : cos( sin(

2. Ifodani soddalashtiring:  .

3. Ifodaning shaklini almashtiring: .

4. Ayniyatni isbotlang:  .

5. cos va α – III chorakda bo’lsa, sin2α va cos2α ni toping.

Yechimlari:

I variant

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