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[" 9."cos((1)/(2)+x)cos(2 pi+x)[cot((pi)...

[" 9."cos((1)/(2)+x)cos(2 pi+x)[cot((pi)/(2)-x)+cot(2 pi+x)]=1],[" 10."sin(n+1)x sin(n+2)x+cos(n+1)x cos(n+2)x=cos x],[" 11"cos((3 pi)/(2)+x)-cos((3 pi)/(2)-x)=-sqrt(2)sin x]

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cos((3pi)/(2) +x) cos(2pi+x)[cot(3pi)/(2)-x+cot(2pi+x)]=1

sin m((pi)/(2)+x)+cos n((pi)/(2)-x)

Prove that cos((3pi)/(2)+x)cos(2pi+x)[cot((3pi)/(2)-x)+cot(2pi+x)]=1

Prove that cos((3pi)/2+x)cos(2pi+x)[cot((3pi)/2-x)+cot(2pi+x)]=1

Prove that: cos((3 pi)/(2)+x)cos(2pi+x)[cot((3 pi)/(2)-x)+cot(2 pi+x)]=1

cos ((3pi )/( 2 ) + x) cos (2pi + x) [cot ((3pi)/( 2)- x ) + cot (2pi +x) ]=1

cos ((3pi )/( 2 ) + x) cos (2pi + x) [cot ((3pi)/( 2)- x ) + cot (2pi +x) ]=1

cos ((3pi )/( 2 ) + x) cos (2pi + x) [cot ((3pi)/( 2)- x ) + cot (2pi +x) ]=1

Prove that: cos((3pi)/2+x)cos(2pi+x)[cot((3pi)/2-x)+cot(2pi+x)]=1

Prove that cos((3pi)/(2)+x)cos(2pi+x).{cot((3pi)/(2)-x)+cot(2pi+x)}=1