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The value of sin^(2)5^(@)+sin^(2)10^(@)+...

The value of `sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ . . . .+sin^(2)90^(@)` is equal to

A

`7 (1)/(2)`

B

`8 (1)/(2)`

C

9

D

`9 (1)/(2)`

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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  2. If a=5, b=13, c=12 in a triangle A B C, then tan ((B)/(4))=

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  3. The value of sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ . . . .+sin^(2)...

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  4. The triangle A B C is right angled at C, then tan A+tan B=

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  11. If 0ltxlt(pi)/(2), then the largest angle of a triangle whose sides ar...

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  12. cos 1^(circ)+cos 2^(circ)+cos 3^(circ)+...+cos 180^(circ)=

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  13. The value of (tan 70^(circ)-tan 20^(circ))/(tan 50^(circ))=

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  18. If 12 cot^(2)theta - 31 cosec theta+32 = 0 then the value of Sin theta...

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