There are five ways to describe people 500-600 words, including description of appearance, language, manner, psychology and details. If you write a composition, it's not necessarily original. The teacher asks you to copy it,

There are five ways to describe people 500-600 words, including description of appearance, language, manner, psychology and details. If you write a composition, it's not necessarily original. The teacher asks you to copy it,

I can't forget his clothes drenched by rain. Open a window gently and sip a sip of tea quietly. Let the fragrance of flowers outside the window and the fragrance of tea in the cup join me in meditation and aftertaste. In the long river of memory, there is a

The value of tan20 ° + tan40 ° + 3tan20 ° · tan40 ° is ()
A. 3B. -3C. 33D. -33

Tan20 ° + tan40 ° + 3tan20 ° · tan40 ° = Tan (20 ° + 40 °) [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3 [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3-3tan20 ° tan40 ° + 3tan20 ° tan40 ° = 3, so select a

The value of tan20 ° + tan40 ° + 3tan20 ° · tan40 ° is ()
A. 3B. -3C. 33D. -33

Tan20 ° + tan40 ° + 3tan20 ° · tan40 ° = Tan (20 ° + 40 °) [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3 [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3-3tan20 ° tan40 ° + 3tan20 ° tan40 ° = 3, so select a