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• 1 、I want to learn street dance
• 2
  、How to judge monotonicity and solve it

I want to learn street dance

1. For girls who want to learn street dance, it is recommended to choose based on their personal interests and physical conditions. If you are interested in strength and skills, try Breaking or Popping. If you prefer rhythmic and expressive dances, then Hip-hop or Jazz would be a good choice. Of course, the most important thing is to find the dance you like, keep practicing, and enjoy the fun of dancing. In general, street dance is not an insurmountable obstacle for girls.

2. Although street dance has no special requirements on physical conditions such as height and weight, good physical conditions can help dancers master movements faster and improve their dance level. If you are a beginner, you can start with basic physical training and strengthen your strength, flexibility, coordination and other aspects of training. At the same time, participate in street dance courses, study under the guidance of professional coaches, and gradually master the basic movements and skills of street dance.

3. For those who are not in good physical fitness and are more introverted, choosing the right street dance type is crucial. Locking is a good choice and can help you become cheerful. Locking dance emphasizes the joy and freedom of dancers, so it is very suitable for introverts to participate. By learning lockdown dances, you can gradually become more confident and cheerful. Popping is also a good choice.

How to judge monotonicity and solve it

Intuitive method: Intuitive method is the simplest method. It judges monotonicity by observing the size relationship between adjacent terms of the sequence. If each item in the sequence is greater than the previous item, then the sequence is increasing (or decreasing). This method works well for simple sequences, but may not always be effective in complex sequences.

Draw conclusions: Draw conclusions based on the definition (if the difference is 0, it is an increasing function; if the difference is 0, it is a decreasing function). That is,"arbitrary value-make differences and deform-judge and determine the number-draw conclusions."

The most common way to judge the monotonicity of a function is to use derivatives. The specific steps are as follows: Find the derivative of the function: Take the derivative of the given function $f (x)$to get the derivative expression $f^{prime}(x)$. For example, for the function $f (x)=x^{3}-3x + 2$, its derivative is $f^{prime}(x)=3x^{2}-3$.

The method for finding monotonicity of derivatives is as follows: Find derivative function First, derivative a given function to obtain its derivative function. The derivative function describes the tangent slope of the original function at each point, thus reflecting the change trend of the original function. Determine the strictly increasing interval of monotonicity: In order to find the strictly increasing interval of the function, you need to make the derivative greater than 0 and solve this inequality. The range of x obtained is the interval where the function strictly increases.