The value of the expression 2 2 2 2 2 sin 22 sin 68 sin 63 cos63 sin27 cos 22 cos 68 °+ ° + °+ ° ° °+ ° is
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sin^2 22+sin^2 68/cos^2 22+cos^2 68+sin^2 63+sin^2 27
sin^2 22+ cos^2 22/sin^2 68+cos^2 68+sin^2 63+sin^227
=1/1+1
=2
in this question you have two know
sinA =cos (90-A)
cosA=sin (90-A)
sin^2 A+cos^2 A=1
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