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sin^(2)5^@+sin^(2)10^@+sin^(2)15^@ +.......

`sin^(2)5^@+sin^(2)10^@+sin^(2)15^@ +.......+sin^(2)85^@ + sin^(2)90^@=`

A

7

B

8

C

9

D

`9(1)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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sin^2 75^@-sin^2 15^@ =

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The numerical value of sin^(2)5^circ + sin^(2)10^circ + sin^(2)15^circ + . . . + sin^(2)90^circ=.........

TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES -COMPETITIVE THINKING
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  2. Find the value of the expression 3[sin^(4)((3pi)/(2)-alpha)+sin^(4)(...

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  3. sin^(2)5^@+sin^(2)10^@+sin^(2)15^@ +.......+sin^(2)85^@ + sin^(2)90^@=

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  13. If 5(tan^2x - cos^2x)=2cos 2x + 9, then the value of cos4x is

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  14. x+1/x=2cosalpha then x^n+1/x^n=

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  15. If sin x + cos x = 1/5, then tan 2x is

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  16. If A lies in the third quadrant and 3 tan A-4 = 0, then 5 sin 2A + 3si...

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