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初学三角函数,记忆特殊角三角函数值易错易混.若在理解掌握的基础上,经过变形,使其呈现某种规律,再配以歌诀,则可浅显易记,触目成诵.
Beginner trigonometric function, memory special angle trigonometric function value is easy to be misunderstood. If it is based on understanding and mastering, after being deformed to make it show some rules, and matched with songs, it can be easy to remember and impress.