** Final Answer

**

** Step-by-step Solution **

Problem to solve:

** Specify the solving method

**

**

Calculate the power $30^2$

Learn how to solve simplify trigonometric expressions problems step by step online.

$\sin\left(30\right)^2-2\cdot \cos\left(900\right)$

Learn how to solve simplify trigonometric expressions problems step by step online. Simplify the trigonometric expression sin(30)^2-2cos(30^2). Calculate the power 30^2. The sine of 30 equals \frac{1}{2}. Calculate the power \left(\frac{1}{2}\right)^2. The cosine of 900 equals -1.

** Final Answer

**