It is known that ∠1 and ∠2 are two acute angles in a right triangle, ∠1=75°, then ∠2=how many degrees.
已知∠1和∠2是直角三角形中的两个锐角，∠1=75°，则∠2=多少°．
<gadget id="calculator">180 - 90 - 75</gadget>
<output>15</output>

<result>15</result>