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NAGEEN PRAKASHAN ENGLISH-TRIGNOMETRIC FUNCTIONS-EXERCISES 3.3
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Play - Find the value of: sin75^(0)
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Play - 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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Play - (tan(pi/4+x))/(tan(pi/4-x)) = ((1+tanx)/(1-tanx))^(2)
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Play - (cos(pi-x)cos(-x))/(sin(pi-x)cos(pi/2+x))=cot^(2)x
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Play - Prove that: cos((3pi)/2+x)cos(2x+x)[cot((3pi)/2-x)+cot(2pi+x)]=1
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Play - sin(n+1)xsin(n+2)x+cos(n+1)xcos(n+2)x=cosx
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Play - Prove that, cos((3pi)/4+x) - cos((3pi)/4-x)=-sqrt(2)sinx.
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