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A N EXCEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-QUESTION BANK
- Prove that (1+costheta+sintheta)/(1-costheta+sintheta)=cot(theta/2)
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- If tan(A/2)=x show that secA+tanA=(1+x)/(1-x)
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- Prove that sin^2(pi/6)+cos^2(pi/3)-tan^2(pi/4)=-1/2
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- Prove that 2sin^2(pi/6)+cosec^2((7pi)/6)cos^2(pi/3)=3/2
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- Prove that cot^2(pi/6)+cosec((5pi)/6)+3tan^2(pi/6)=6
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- Prove that 2sin^2((3pi)/4)+2cos^2(pi/4)+2sec^2(pi/3)=10
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- Find the value of sin 75^@
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- Show that tan 15^@ = 2 - sqrt3
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- Prove that cos(pi/4-x)cos(pi/4-y)-sin(pi/4-x)sin(pi/4-y)=sin(x+y)
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- prove that (tan(pi/4+x))/(tan(pi/4-x))=((1+tanx)/(1-tanx))^2
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- Prove that (cos(pi+x)cos(-x))/(sin(pi-x)cos(pi/2+x)=cot^2x
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- Prove that cos((3pi)/2+x)cos(2pi+x)[cot((3pi)/2-x)+cot(2pi+x)]=1
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- Prove that sin(n+1)xsin(n+2)x+cos(n+1)xcos(n+2)x=cosx
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- Prove that cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt2 sinx
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- prove the following sin^2 6x-sin^2 4x =sin2xsin10x
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- Prove that cos^2 2x-cos^2 6x=sin4x sin8x
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- prove the following sin2x+2sin4x+sin6x=4cos^2xsin4x
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- Prove that cot4x(sin5x+sin3x)=cotx(sin5x-sin3x)
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- Prove that (cos9x —cos5x)/(sin17x-sin3x)=(-sin2x)/(cos10x).
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- Prove that (sin5x+sin3x)/(cos5x+cos3x)=tan4x
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