The value of equation 1-2sin30 ° and cos30 ° is___ ．

The original formula is 1-2 × 12 × 32 = 1-32 = 2-32

How to calculate sin

sin（cos30º）=1/sin30*sincos30º）=1+tan30=1+1/3

Cos30 = 4 parts of Y, then what is y?

Answer: double root 3
Analysis: cos30 ° = Y / 4
Then, y = 4cos30 ° = 4 * (2 / 2 radical 3) = 2 times radical 3

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