If the sides of a triangle are sina, cosa,1+sinα cosα,0<α <π2 the largest angle is

If the sides of a triangle are ,,$0$ the largest angle is

1. A

$60°$

2. B

$90°$

3. C

$120°$

4. D

$150°$

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Solution:

The largest side is

$\mathrm{cos}C=\frac{{a}^{2}+{b}^{2}-{c}^{2}}{2ab}$

.

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