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paradox xyz cool Grade: 11
        

prove that


sin^2 24 - sin^2 6= (5^1/2 - 1 )/8

6 years ago

Answers : (3)

vikas askiitian expert
510 Points
										

sin224 - sin26 = (51/2-1)/8


we have to prove this


sin2A - sin2B = sin(A-B)sin(A+B)


taking LHS


sin224 - sin26= sin18sin30=(sin18)/2


sin18 = (51/2-1)/4


so LHS becomes


          = (51/2-1)/8 =RHS


hence proved

6 years ago
SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


We know that



sin(A + B)sin(A - B) = sin^(2)A - sin^2(2)B


A=24


B=6




Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.


All the best.


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Askiitians Expert


Sagar Singh


B.Tech, IIT Delhi



6 years ago
jagdish singh singh
168 Points
										

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6 years ago
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