Question

1)cos60°-·cos30°·sin45°+ctg30°·tg150°-tg45° 2)sin+√2·cos-√3·ctg 3)sin(-)+cos()+sin()+cos() 4)·

Answer 1

У двоих последних вместо x нужно a

если есть вопросы пишите

Answer 2

It seems like there might be some missing information or errors in the expressions you provided. Some of the expressions are not complete or have unclear notation. Let me try to interpret what you might mean and solve the expressions accordingly:

1. cos 60° - cos 30° · sin 45° + ctg 30° · tg 150° - tg 45°:

Step-by-step solution: cos 60° = 1/2 cos 30° = √3/2 sin 45° = √2/2 ctg 30° = 1/tan 30° = 1/√3 tg 150° = tan (180° - 150°) = tan 30° = √3/3 tg 45° = 1

Now, let's substitute the values: 1/2 - (√3/2) · (√2/2) + (1/√3) · (√3/3) - 1

Simplifying the terms: 1/2 - √6/4 + 1/3 - 1

Combining the terms: (3 + 6 - 4 - 6) / 6 = -1/6

So, the value of the expression is -1/6.

2. sin + √2 · cos -√3 · ctg:

The expression seems incomplete as it lacks angles for trigonometric functions. If you provide the angles, I can help you solve the expression.

3. sin(-) + cos() + sin() + cos():

The expression seems to have incomplete or missing angles for trigonometric functions. Please provide the angles for sin, cos, and any other trigonometric functions present, so I can solve the expression for you.

4. ·

This appears to be incomplete, and there's no clear mathematical expression to solve. If you meant to input a specific mathematical expression, please provide the full expression, and I'll be happy to help you with it.