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Prove that: "sin"20^0"sin"40^0"sin"60^0"...

Prove that: `"sin"20^0"sin"40^0"sin"60^0"sin"80^0=3/(16)`

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Prove that: sin20^0sin40^0sin60^0sin80^0=3/(16)

Prove that: sin20^0sin40^0sin60^0sin80^0=3/(16)

Prove that: sin 50^0-sin 70^0+sin 10^0=0

Prove that: sin10^0sin30^0sin50^0sin70^0=1/(16)dot

Prove that: sin10^0sin30^0sin50^0sin70^0=1/(16)dot

Prove that: sin10^0sin30^0sin50^0sin70^0=1/(16)dot

Prove that: sin20^0sin40^0sin80^0=(sqrt(3))/8

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

Prove that: sin6^0sin42^0sin 66^0sin 78^0=1/(16)

Prove that: \ sin 10^0sin 50^0sin 60^0sin 70^0=(sqrt(3))/(16)

RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF MULTIPLE AND SUBMULTIPLE ANGLES-All Questions
  1. Prove that : cos Acos(60-A)cos(60+A)=1/4cos3A

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  2. Prove that: "s i n A s i n"(60-"A")sin(60+"A")=1/4sin3"A"dot

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  3. Prove that: "sin"20^0"sin"40^0"sin"60^0"sin"80^0=3/(16)

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  4. prove sin(5theta) = 16sin^5(theta)-20sin^3(theta)+5sin(theta)

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  5. Prove that 4(cos ^(3) 10^(@) + sin ^(3) 20^(@)) = 3 ( cos 10^(@) + sin...

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  6. Prove the following identity: cos^3thetasin3theta+sin^3thetacos3theta=...

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  7. Prove the following identity: \ t a nthetat a n(theta+60^0)+t a ntheta...

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  8. Prove that: t a nA+tan(60^0+A)-t a n(60^0-A)=3t a n3A

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  9. Prove that: cotA+"cot"(60^0+A)-cot(60^0-A)=3cot3A

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  10. Prove the following identity: cot A+cot(60^0+A)+cot(120^0+A)=3cot3A

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  11. Prove that: sin^3A+sin^3((2pi)/3+A)+sin^3((4pi)/3+A)=-3/4sin3Adot

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  12. Prove that: |costhetacos(60^0-theta)cos(60^0+theta)lt=1/4 for all valu...

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  13. Prove that: sin(pi/5) sin2pi/5 sin3pi/5 sin4pi/5=5/16

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  14. Prove that cos((2pi)/(15))cos((4pi)/(15))cos((8pi)/(15))cos((16pi)/(15...

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  15. Prove that: sin 12^0sin 48^0sin 54^0=1/8dot

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  16. The value oif the expressin (1+cospi/10)(1+cos(3pi)/10)(1+cos(7pi)/10)...

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  17. Prove that ; 4 sin 27^@=(5+sqrt(5))-sqrt((3-sqrt(5))) we have

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  18. Prove that : sin^2(72^@) - sin^2 (60^@) = (sqrt5 - 1)/8

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  19. Prove that: sin^2 24^0-sin^2 6^0=(sqrt(5)-1)/8

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  20. Prove that: sin^2 42^0-cos^2 78^0=(sqrt(5)+1)/8

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