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" 5.(i) "cos^(2)(theta+45^(@))+cos^(2)(t...

" 5.(i) "cos^(2)(theta+45^(@))+cos^(2)(theta-45^(@))=1

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cos^(2)(theta-45^(@))+cos^(2)(theta+15^(@)-cos^(2)(theta-15^(@))=

Cos (theta + 45^(@)) + Sin (theta - 45^(@)) =

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Evaluate : (cos^(2)(45^(@) + theta)+ cos^(2) (45^(@) -theta))/(tan(60^(@) + theta) xx tan(30^(@) - theta))+(cot30^(@) + sin 90^(@))xx (tan60^(@) -sec0^(@))