show that 2 cos 2A+1/2 cos 2A -1=tan 60+a x tan 60 -A
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Gaurav Seth 1 month, 3 weeks ago. Step -by -step explanation: tan20° tan40° tan80° ... [∵,cos60°=1/2] = {sin(20°+80°)-sin(20°-80°)-sin80°}/{cos80°+cos(20°+80°)+cos(20°-80°)} ... +√3/2}/{2cos(100°+80°)/2cos(100°-80°)/2+1/2} [∵, sin60°=√3/2 and cos60°=1/2] ... Find general solution of tan(2x)+1=0. Report.
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