Sin2π/6+sin²3π/6+sin²5π/6+sin²7π/6
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sin²π/6+sin²3π/6+sin²5π/6+sin²7π/6
=sin²π/6+sin²3π/6+sin²(π/2+π/6)+sin²(π/2+3π/6)
=sin²π/6+sin²3π/6+cos²π/6+cos²3π/6
=(sin²π/6+cos²π/6)+(sin²3π/6+cos²3π/6) [∵, sin²Ф+cos²Ф=1]
=1+1
=2 Ans.
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