Prove that: cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=(-1)/16
Cos 5pi/3 - Find Value of Cos 5pi/3 | Cos 5π/3
![SOLVED: Entered Answer Preview (45 [(n^2)*(pi"2)])*[cos((n"pij5)-1]-[2I(n*pi )]*sin((n"pi)5) 7272 (cos( 3 1) TlTt -sin(7) [1(n"pi)]"(9-55*[(-1)^n])+[2Y(n" pi)]"cos((n"pi)/5)+(45/[(n*2)*(pi*2)])*sin((n*pi)/5) 7(9 55-17") + TTt n7 cosL 7) n2t2 sin ( 7 ...](https://cdn.numerade.com/ask_images/fc562fe91c514fa2837c7802efc06043.jpg "SOLVED: Entered Answer Preview (45 [(n^2)*(pi\"2)])*[cos((n\"pij5)-1]-[2I(n*pi )]*sin((n\"pi)5) 7272 (cos( 3 1) TlTt -sin(7) [1(n\"pi)]\"(9-55*[(-1)^n])+[2Y(n\" pi)]\"cos((n\"pi)/5)+(45/[(n*2)*(pi*2)])*sin((n*pi)/5) 7(9 55-17\") + TTt n7 cosL 7) n2t2 sin ( 7 ...")
SOLVED: Entered Answer Preview (45 [(n^2)*(pi"2)])*[cos((n"pij5)-1]-[2I(n*pi )]*sin((n"pi)5) 7272 (cos( 3 1) TlTt -sin(7) [1(n"pi)]"(9-55*[(-1)^n])+[2Y(n" pi)]"cos((n"pi)/5)+(45/[(n*2)*(pi*2)])*sin((n*pi)/5) 7(9 55-17") + TTt n7 cosL 7) n2t2 sin ( 7 ...
Cos(pi/2n+1)+cos(3pi/2n+1)...upto n terms equals?
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&line2=\mathrm{Solution:\:}\frac{\sqrt{5}%2B1}{2} "2cos(pi/5)")
2cos(pi/5)
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CBSE Class 11-science Answered
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The value of cospi/11 + cos3pi/11 + cos5pi/11 + cos7pi/11 + cos9pi/11 is
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Prove that,cos(pi/5)-cos((2pi)/5)=1/2
