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Show that sin^2 52^@ + sin^2 38^@=1...

Show that `sin^2 52^@ + sin^2 38^@=1`

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`LHS=sin^2 52^@+ sin^2(90^@-52^@)=sin^2 52^@+sin^2(90^@-52)=sin^2 52^@+cos^2 52^@ =1=RHS`
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