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What is (cos^(2)(45^(@)+theta)+cos^(2)(4...

What is `(cos^(2)(45^(@)+theta)+cos^(2)(45^(@)-theta))/(tan(60^(@)+theta)tan(30^(@)-theta))` equal to ?

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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^(@))

Evaluate : (cos^(2)(45+theta)+cos^(2)(45-theta))/(tan(60^(@)+theta)tan(30^(@)-theta))+cos ec(75^(@)+theta)-sec(15^(@)-theta)

The value of sin(45^(@)+theta) - cos(45^(@)-theta) is

The value of sin(45^(@)+theta)-cos(45^(@)-theta) is

If theta=45^(@) then (tan^(2)theta-1)/(sec^(2)theta)=

If theta=60^(@) , then (1+tan^(2)theta)/(2tan theta) is equal to

tan^(2)theta-tan^(2)(90^(@)-theta)=(sin^(2)theta-cos^(2)theta)/(sin^(2)theta cos^(2)theta)

Show that (cos^(2)theta - sin^(2)theta)=(2tan theta)/((1- tan^(2)theta)) is not an identity .