secA - tanA = 4 then prove that cosA = 8/17
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1/cosA-sinA/cosA =4
1-sin2A/cos^2=4
1-sin2A=cos^216
sinA2=cos2*17
sinA=cosA 17
cosA17=cos^2A 2*4
cosA17=cos^8
cosA=8/17
1-sin2A/cos^2=4
1-sin2A=cos^216
sinA2=cos2*17
sinA=cosA 17
cosA17=cos^2A 2*4
cosA17=cos^8
cosA=8/17
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