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1. Trig expression from a point on the terminal side ●●●○○ 50 ptsLet $\alpha$ be an angle in the second quadrant. The point $P(x, \sqrt{5})$ lies on the terminal side of $\alpha$, and $\cos\alpha = \frac{\sqrt{2}}{4}x$. Find $4\cos\left(\alpha + \frac{\pi}{2}\right) - 3\tan\alpha$. Round to two decimal places.