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The value of sin^2 75^0-sin^2 15^0 is a....

The value of `sin^2 75^0-sin^2 15^0` is a.` 1//2` b. `sqrt(3)//2` c. 1 d. 0

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF COMPOUND ANGLES-All Questions
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  9. The value of: tan3A-tan2A-tanA =

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