1 |
sin50° |
| ||
cos50° |
1 |
sin50° |
| ||
cos50° |
cos50°+
| ||
sin50°cos50° |
2(
| ||||||
sin50°cos50° |
2(sin30°cos50°+ cos30°sin50°) |
sin50°cos50° |
2sin(30°+50°) |
sin50°cos50° |
2sin80° |
sin50°cos50° |
2sin80° | ||
|
2sin80° | ||
|
二倍角的正弦;两角和与差的正弦函数.
本题主要考查了三角变换公式的运用,做题时尽量凑公式的形式.
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