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NAGEEN PRAKASHAN ENGLISH-TRIGNOMETRIC FUNCTIONS-EXERCISES 3E
- Express each of the following as a sum or difference of sine and cosin...
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- Evaluate: sin(521/2)^(@) cos(7(1/2))^(@)
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- Prove that: cos(45^(@)+A) cos(45^(@)-A)=1/2 cos2A
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- Prove that: cos Acos(60^0-A)cos(60^0+A)=1/4cos3A
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- If A=30^(@), show that : sin3A=4sinAsin(60^(@)-A)sin(60^(@)+A)
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- Prove that: tan(pi/3-A).tan(pi/3+A)= (2cos2A+1)/(2cos2A-1)
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- Prove that: i) sin20^(@)sin40^(@)sin60^(@)sin80^(@)=3/16 ii) sin10...
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- Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20...
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- Prove that: tan20^0tan40^0tan80^0=tan60^0
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- Prove that: tan(A+B)/(2) + tan(A-B)/(2) = (2sinA)/(cosA+cosB)
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- Prove that: i) sin50^(@)-sin70^(@)+sin10^(@)=0 ii) sin(60^(@)+A)+s...
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- Prove that: i) sin(5pi)/(18) - cos(4pi)/(9) = sqrt(3)sinpi/9 ii) c...
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- Prove that: (sinA+sinB)/(sinA-sinB) = tan((A+B)/(2)). Cot((A-B)/(2))
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- Prove that: (sin9A-sin7A)/(cos7A-cos9A) = cot8A
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- Prove that: (cos2A+cos3A+cos4A)/(sin2A+sin3A+sin4A)= cot3A
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- Prove that: (sin7A-2sin4A+sinA)/(cos7A-2cos4A+cosA)=tan4A
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- Prove that: (sin(A+B)-2sinA+sin(A-B))/(cos(A+B)-2cosA+cos(A-B))= tan...
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- Prove that (cosA-cosB)^2+(s in A-s in B)^2=4sin^2(A-B)//2]
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- show that cos2thetacos(theta/2)-cos3thetacos((9theta)/2)=sin5thetasin(...
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