if sin thita =4/5 then find cos
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solve:.sin thita=4/5=lamb/karn
=lamb=4
=karn=5
karnsquare=lambsquare+aadharsquare
5^2=4^2+aadhar square
25=16+aadhar square
aadhar square=25-16
aadhar square=root 9
aadhar=3
cos=aadhar/karn
=3/5 is the correct answer
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