If tan theta = 1 upon 2√2 then find the value of cos square theta
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Step-by-step explanation:
sec^2teta-tan ^2teta=1
sec^2teta=1+tan^2teta
=1+(1/2× root2)^2
=1+1/8
=8+1/8
sec^2teta =9/8
but sec^2teta=1/cos^2teta
cos^2teta=1/sec^2teta
=8/9.
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