Sin^2(22)° +sin^2(68)° /cos^2(22)° + cos^2(68)°. + sin^2(63)° + cos(63)°sin(27)= ?
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=Sin^2(22)°+Cos^2(90-68)°/[Cos^2(22)°+Sin^2(90-68)°+Sin^2(63)°+Cos(63)°×Cos(90-27)°]
=Sin^2(22)°+Cos^2(22)°/[Cos^2(22)°+Sin^2(22)°+Sin^2(63)°+Cos^2(63)°]
=1/(1+1)
=1/2
=Sin^2(22)°+Cos^2(22)°/[Cos^2(22)°+Sin^2(22)°+Sin^2(63)°+Cos^2(63)°]
=1/(1+1)
=1/2
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