$$\sin 90+ \cos 60+ \tan 45$$
$\frac{5}{2}=2.5$
$$1+\cos(60)+\tan(45)$$
$$1+\frac{1}{2}+\tan(45)$$
$$\frac{3}{2}+\tan(45)$$
$$\frac{3}{2}+1$$
$$\frac{5}{2}$$
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