Prove that cos6^@ . cos42^@. cos66^@ cos...

Prove that `cos6^@ . cos42^@. cos66^@ cos78^@= 1/16`

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Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

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NAGEEN PRAKASHAN-TRIGNOMETRIC FUNCTIONS-EXERCISES 3G

Prove that: s in^2 24^0-s in^2 6^0=(sqrt(5)-1)/8
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Prove that: sin^(2)42^(2)-cos^(2)78^(@)=(sqrt(5)+1)/(8)
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Provet that: sin^(2)72^(2)-sin^(2)60^(2)=(sqrt(5)-1)/(8)
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Prove that: cos 78^0cos 42^0cos 36^0=1/8
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FInd sin(pi/10). cos(pi/5)
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Prove that: sin(9pi)/(10) + sin(13pi)/(10)=-1/2
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(1+cos (pi/10))(1+cos ((3 pi)/10))(1+cos((7 pi)/10))(1+cos((9 pi)/10))...
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Prove that cos6^@ . cos42^@. cos66^@ cos78^@= 1/16
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Prove that: s inpi/5s in(2pi)/5s in(3pi)/5s in(4pi)/5=5/(16)
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Prove that:tan6^0tan42^0tan66^0tan78^0=1.
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Prove that cos(2pi)/(15)cos(4pi)/(15)cos(8pi)/(15)cos(14pi)/(15)=1/(16...
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