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a, biết $sin ∝ =\dfrac{2}{5}$. Tính $P=(1-3cos2∝).(2+cos2∝)$ b, biết $cos∝=\dfrac{2}{\sqrt[]{5}}($ $\dfrac{-\pi}{2}<∝<0)$ – Tính sin∝,cot∝,sin2∝.
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