Costheta costheta/2-cos3theta cos9theta/2=
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let theta =@
[email protected]@/[email protected]/2
=>1/2{[email protected]@/2}-1/2{[email protected]@/2}
=>1/2(cos3@/2 +cos@/2)-1/2(cos15/2@+cos3@/2)
=>1/2(cos@/2-cos15@/2)
=>1/2 x [email protected]@
hence ,
sin8 theta .sin7@
[email protected]@/[email protected]/2
=>1/2{[email protected]@/2}-1/2{[email protected]@/2}
=>1/2(cos3@/2 +cos@/2)-1/2(cos15/2@+cos3@/2)
=>1/2(cos@/2-cos15@/2)
=>1/2 x [email protected]@
hence ,
sin8 theta .sin7@
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