1.4_9_Қосу формуласы_Қосымша-3

Үйге тапсырма

№ 498.

1)              cos (= cos cosα – sin sinα = cosα – sinα

2)              sin(= sin cosα – cos sinα =    cosα –  sinα  

№ 499.

1. sin150⁰= sin(⁰+60⁰)= sin90⁰ cos60⁰ + cos 90⁰ sin60⁰ =1  +0  =  

2.cos150⁰= cos(⁰+60⁰)=cos90⁰ cos60⁰ – sin90⁰ sin60⁰=0   =  

№ 501.

cos103⁰ cos13⁰ + sin103⁰ sinβ13⁰ =cos(103⁰ – 13⁰)=cos 90⁰ =0

cos15⁰ cos30⁰ –  sin30⁰ sinβ15⁰ =cos(15⁰ + 30⁰)=cos 45⁰ =

 sin51⁰ cos39⁰ + cos51⁰ sin39⁰=sin(51⁰+39⁰)=sin90⁰=1

Үйге тапсырма

№ 498.

3)              cos (= cos cosα – sin sinα = cosα – sinα

4)              sin(= sin cosα – cos sinα =    cosα –  sinα  

№ 499.

1. sin150⁰= sin(⁰+60⁰)= sin90⁰ cos60⁰ + cos 90⁰ sin60⁰ =1  +0  =  

2.cos150⁰= cos(⁰+60⁰)=cos90⁰ cos60⁰ – sin90⁰ sin60⁰=0   =  

№ 501.

cos103⁰ cos13⁰ + sin103⁰ sinβ13⁰ =cos(103⁰ – 13⁰)=cos 90⁰ =0

cos15⁰ cos30⁰ –  sin30⁰ sinβ15⁰ =cos(15⁰ + 30⁰)=cos 45⁰ =

 sin51⁰ cos39⁰ + cos51⁰ sin39⁰=sin(51⁰+39⁰)=sin90⁰=1