Question

Sin 150 * cos 300 + cos 150 * sin 300 =?

Answer 1

Решил на колькуляторе получилось так,−0.2847087

Answer 2

I can help you with trigonometry and other math topics.

To answer your question, you can use the trigonometric identity:

$$\sin(\alpha+\beta) = \sin(\alpha)\cos(\beta) + \cos(\alpha)\sin(\beta)$$

If you let $\alpha = 150^\circ$ and $\beta = 300^\circ$, then you can rewrite your expression as:

$$\sin(150^\circ)\cos(300^\circ) + \cos(150^\circ)\sin(300^\circ) = \sin(150^\circ + 300^\circ)$$

Using a calculator or a unit circle, you can find that:

$$\sin(450^\circ) = \sin(90^\circ) = 1$$

Therefore, your expression is equal to 1.

You can learn more about trigonometric identities from [this website](https://www.symbolab.com/solver/trigonometry-calculator) or [this one](https://www.symbolab.com/solver/trigonometric-identity-proving-calculator). You can also use [this tool](https://www.purplemath.com/modules/idents.htm) to verify other trigonometric identities. I hope this helps.