if sinΦ=1/2 find the value of sin²Φ_cos²Φ
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sin theeta = opp/hyp=1/2
then by Pythagoras theorem
(hyp)square=(opp)square+(adj)square
2square=1square+adjsquare
4=1+x
x=3,then
sin square theeta=1/4
cos square theeta=9/4
1/4-9/4 = -8/4 = -2
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