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(sin^2 6 3^(@)+sin^2 2 7^(@))/(cos^2 1 7...

`(sin^2 6 3^(@)+sin^2 2 7^(@))/(cos^2 1 7^(@)+cos^2 7 3^(@))`

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(cos^2 3 3^(@)-cos^2 5 7^@)/(sin2 1^@-cos2 1^@)=

(cos^2 3 3^(@)-cos^2 5 7^@)/(sin2 1^@-cos2 1^@)=

sin^2 52 1/2^@-cos^2 7 1/2^@

2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) = 3/2

2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) = 3/2