Предмет: Математика, автор: akuls

Решите пожалуйста!Умоляю!!!!!

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Автор ответа: Дианчик0444

1)cos 780°=cos(720°+60°)=cos60°=1/2
sin 13π/6= sin π/6=1/2
sin 750°=sin(720+30)=sin30=1/2
cos11π/6=cos330°=1/2
2) sin²a=225/289
cos²a=1-sin²a=1-225/289= 64/289
cos2a=cos²a - sin²a
cos2a=64/289 - 225/289= -161/289

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Read the text "Regular physical activity".

Optimal-Use-Of-Physical-Exercise-To-Improve.jpg

Regular physical activity can produce long term health benefits. People of all ages, shapes, sizes, and abilities can benefit from being physically active. The more physical activity you do, the greater the health benefits.

Being physically active can help you:

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• Muscle-strengthening activities make your muscles stronger. These include activities like push-ups and lifting weights. It is important to work all the different parts of the body - your legs, hips, back, chest, stomach, shoulders, and arms.

• Bone-strengthening activities make your bones stronger. Bone strengthening activities, like jumping, are especially important for children and adolescents. These activities produce a force on the bones that promotes bone growth and strength.

• Balance and stretching activities enhance physical stability and flexibility, which reduces risk of injuries. Examples are gentle stretching, dancing, yoga, martial arts, and t'ai chi.

Match the parts of these sentences. Write the correct number of the second part (1,2,3...).

The first part:

1. Being physically active can help you increase

2. Some types of physical activity

3. Balance and stretching activities enhance physical stability and flexibility,

The second part:

1) long term health benefits.

2) benefit from being physically active.

3) the health benefits.

4) your chances of living longer.

5) you are more likely to get type 2 diabetes.

6) together for better health.

7) calories burned.

8) are especially beneficial.

9) your heart beat faster.

10) vigorous in their intensity.

11) important for children and adolescents.

12) which reduces risk of injuries.

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