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NAGEEN PRAKASHAN-TRIGNOMETRIC FUNCTIONS-EXERCISES 3E
- Express each of the following as a sum or difference of sine and cosin...
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- Evaluate: sin521/2^(@) cos71/2^(@)
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- Prove that: cos(45^(@)+A) cos(45^(2)-A)=1/2 cos2A
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- Prove that: cosA. Cos(60^(@)+A)cos(60^(2)-A)=1/4 cos3A
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- Prove that: sinA. Sin(60^(2)+A).sin(120^(@)+A)=1/4sin3A
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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)+(sinA-sinB)^(2)=4sin^(2)(A-B)/(2)
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- Prove that: cos2theta.costheta/2-cos3theta.cos(9theta)/(2)=sin5theta...
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