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```        prove that
sin^2 24 - sin^2 6= (5^1/2 - 1 )/8```
7 years ago

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
```
7 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

All the best.
Win exciting gifts by   answering the questions on Discussion Forum. So help discuss any query   on askiitians forum and become an Elite Expert League askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
7 years ago
jagdish singh singh
168 Points
```
```
7 years ago
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