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sin^2 17.5^@+sin^2 72.5^@ is equal to...

`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^@`

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