tan(a-兀/4)=1/2 且a€(0,兀/2) 则Sina+Cosa=?
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tan(a-兀/4)=1/2 且a€(0,兀/2) 则Sina+Cosa=?
tan(a-兀/4)=1/2 且a€(0,兀/2) 则Sina+Cosa=?
tan(a-兀/4)=1/2 且a€(0,兀/2) 则Sina+Cosa=?
tana=tan(a-45°+45°)=(0.5+1)/(1-0.5×1)=3
sina=十分之三倍根号十
cos=十分之根号十
所以之和为:五分之二倍根号十
等一下,好吗
-0.7