化简(sin1度)^2+(sin2度)^2+…+(sin89度)^2的值为?
化简(sin1度)^2+(sin2度)^2+…+(sin89度)^2的值为?急!!详细过程,谢谢
参考答案:(sin89度)^2=(cos1度)^2
A=(sin1度)^2+(sin2度)^2+…+(sin89度)^2
A=(cos1度)^2+(cos2度)^2+…+(cos89度)^2
两式相加得2A=89
所以A=45.5
化简(sin1度)^2+(sin2度)^2+…+(sin89度)^2的值为?急!!详细过程,谢谢
参考答案:(sin89度)^2=(cos1度)^2
A=(sin1度)^2+(sin2度)^2+…+(sin89度)^2
A=(cos1度)^2+(cos2度)^2+…+(cos89度)^2
两式相加得2A=89
所以A=45.5