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RD SHARMA ENGLISH-TRANSFORMATION FORMULAE-All Questions
- Express each of the following as the product of sines and cosines: sin...
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- Express each of the following as the product of sines and cosines: sin...
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- Express each of the following as the product of sines and cosines: cos...
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- Prove that: sin38^0+sin 22^0=sin 82^0
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- Prove that: \ sin 50^0+sin 10^0=cos 20^0
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- Prove that: sin 105^@+cos 105^@=cos 45^@
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- Prove that: cos 100^0+cos 20^0=cos 40^0
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- Prove that: sin 23^0+sin 37^0=cos7^0
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- Prove that: sin 40^0+sin 20^0=cos 10^0
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- Prove that: cos 55^0+cos 65^0+cos 175^0=0
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- Prove that: cos 80^0+cos 40^0-cos 20^0=0
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- Prove that: sin 80^0-cos 70^0=cos 50^0
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- prove that :sin((5pi)/18)-cos((4pi)/9)=sqrt(3)sin(pi/9)
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- Prove that: sin 50^0-sin 70^0+sin 10^0=0
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- Prove that: cos 20^0+cos 100^0+cos 140^0=0
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- prove that :cos(pi/12)-sin(pi/12)=1/(sqrt(2))
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- Prove that : sin 51^0+cos 81^0=cos 21^0
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- Prove that: cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt(2)sinx
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- Prove that: cos(pi/4+x)+cos(pi/4-x)=sqrt(2)\ cos x
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- Prove that: sin 65^0+cos 65^0=sqrt(2)cos 20^0
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