cosA=-√2/2A=135°
过程大概就是 wfx_wfx回答的那样
因为sinA=1/2,所以A=30°+360°*K或150°+360°*K(K属于Z),又因为A为三角形内角,所以0°因为cosA=-√2/2,所以A=135°+360°*K(K属于Z),又因为A为三角形内角,所以0°
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