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Question #c1c34

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Dec 13, 2016

#cos(2arcsin(-(√2)/2))#

#=cos(2arcsin(-(1/sqrt2))#

#=cos(2arcsin(-(sin(pi/4))#

#=cos(2arcsin(sin(pi-pi/4))#

#=cos(2arcsinsin((3pi)/4))#

#=cos(2xx(3pi)/4)#

#=cos((3pi)/2)#

#=cos(pi+pi/2)#

#=-cos(pi/2)=0#

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