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" (ii) "cos^(2)72^(@)-sin^(2)54^(@)...

" (ii) "cos^(2)72^(@)-sin^(2)54^(@)

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Find the value of cos^(2)72^(@) - sin^(2) 54^(@) .

cos ^ (2) 72 ^ (0) -sin ^ (2) 54 ^ (@) =

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

sin^2 17. 5^(@)+sin^2 72. 5^(@) is equal to............ A) cos ^(2) 90^(@) B) tan ^(2) 45^(@) C) cos ^(2) 30^(@) D) sin ^(2) 45^(@)

cos^(2) 36^(@) + cos^(2) 72^(@)=