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单选题
-9cos2θ- 9sin2θ= ______.
A
0
B
1
C
-1
D
9
E
-9
参考答案
参考解析
解析:
-9cos2θ- 9sin2θ= -9(cos2θ+ sin2θ)= -9(1) = -9
-9cos2θ- 9sin2θ= -9(cos2θ+ sin2θ)= -9(1) = -9
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