Mathematics
Senior High

この問題の途中からわかりません。教えていただきたいです。

4 「iー ーx" da ur x e=Sin 0 とおくを」 ×0>1 90--1 da- los }d0 ニニで、)1ーx* 1-Sin8 = 1(0s9= CosD ニ .て, =4| 9iug:cos)COSB 0 TOFO 4 9in9 ニ

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