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" 8."cos2 theta sec theta=1...

" 8."cos2 theta sec theta=1

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If 8cos2 theta+8sec2 theta=65,0

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If 8 cos 2 theta + 8 sec 2theta = 65, 0 lt theta lt (pi)/(2) then the value of 4 cos 4 theta is

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Prove that (tan 8 theta)/(tan theta)=(1+ sec 2 theta)(1+ sec 4 theta)(1+ sec 8 theta)

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(1-cos^2theta)sec^2 theta= tan^2 theta