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Qiuyun TMUA Simulation Test Paper 1 · Q13

Paper 1Trigonometry

Find the total number of xx, with xx having the form of πk\dfrac\pi k, k∈Zk\in\Z and x∈[−π2,π2]x\in\left[-\dfrac\pi2,\dfrac\pi2\right], for which

[(1−sin⁡x)cos⁡x]′≥0.[(1-\sin x)\cos x]'\ge0.
A22
B44
C66
D88
E1010

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