slove trigonometry ......
urgent please
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sec4A - sec2A =2 1/cos4A - 1/cos2A =2 cos2A+ cos4A =2 cos4A * cos2A cos2A + cos4A = cos6A + cos2A [cosC + cosD= 2 cos(C+D)/2 * cos(C-D)/2 ] cos6A - cos4A = 0 2 sin(6A +4A)/2 sin(4A- 6A) =0 sin5A sin2A =0 so sin5A =0 & sin2A =0 or 5A = 0 & 2A = 0 =0 so A=npi/5& A=npi/2 where n =z [ A = 0 ]
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