三角恒等变换
知识点一:化简求值
1:已知,若,则=
:2:已知函数,求
3:已知,求
4:已知,求的值
5:已知函数,(1)求的值;(2)设的值。
6:已知(1)求的值。(2)求函数的最大值。
知识点二:給值求角
7:已知,求的值。
8:已知,且求的值
9:若sinA=,sinB=,且A, B均为钝角,求A+B的值.
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