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What is the value of sin^(2) 15^(@) + si...

What is the value of `sin^(2) 15^(@) + sin^(2) 20^(@) + sin^(2)25^(@) + ……… + sin^(2) 75^(@)` ?

A

`tan^(2) 15^(@) + tan^(2) 20^(@) + tan^(2)25^(@) ……….. + tan^(2)75^(@)`

B

`cos^(2)15^(@) + cos^(2)20^(@) + cos^(2)25^(@) ……. + cos^(2) 75^(@)`

C

`cot^(2) 15^(@) - cot^(2)20^(@) + cot^(2) 25^(@) +………. + cot^(2) 75^(@)`

D

`sec^(2) 15^(@) + sec^(2) 20^(@) + sec^(2) 25^(@) + ……. + sec^(2) 75^(@)`

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