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Prove that: i) sin20^(@)sin40^(@)sin60...

Prove that:
i) `sin20^(@)sin40^(@)sin60^(@)sin80^(@)=3/16`
ii) `sin10^(@)sin50^(@)sin60^(@)sin70^(@)=sqrt(3)/16`
iii) `sin20^(@)sin40^(@)sin80^(@)=sqrt(3)/8`

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(i) sin10^(@)sin50^(@)sin70^(@)

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NAGEEN PRAKASHAN-TRIGNOMETRIC FUNCTIONS-EXERCISES 3E
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  2. Evaluate: sin521/2^(@) cos71/2^(@)

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  3. Prove that: cos(45^(@)+A) cos(45^(2)-A)=1/2 cos2A

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  4. Prove that: cosA. Cos(60^(@)+A)cos(60^(2)-A)=1/4 cos3A

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  5. Prove that: sinA. Sin(60^(2)+A).sin(120^(@)+A)=1/4sin3A

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  6. Prove that: tan(pi/3-A).tan(pi/3+A)= (2cos2A+1)/(2cos2A-1)

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  7. Prove that: i) sin20^(@)sin40^(@)sin60^(@)sin80^(@)=3/16 ii) sin10...

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  8. Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20...

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  9. Prove that tan20^0tan40^0tan80^0=tan60^0

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