根号2cos(a+30°)=1则锐角a

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根号2cos(a+30°)=1则锐角a根号2cos(a+30°)=1则锐角a根号2cos(a+30°)=1则锐角a√2cos(a+30°)=1cos(a+30°)=√2/2a+30°=45°a=15°

根号2cos(a+30°)=1则锐角a
根号2cos(a+30°)=1则锐角a

根号2cos(a+30°)=1则锐角a
√2cos(a+30°)=1
cos(a+30°)=√2/2
a+30°=45°
a=15°