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Question #e6ede

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Mar 16, 2017

#sin110+cos70*tan190#

#=sin(90+20)+cos(90-20)*tan(180+10)#

#=cos20+sin20*tan10#

#=2cos^2 10-1+2sin10cancelcos10*sin10/cancelcos10#

#=2cos^2 10-1+2sin^210#

#=2(cos^2 10+sin^2 10)-1#

#=2*1-1=1#

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