sina*cosa=4/7 , a=?
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there is no solution for "a" to satisfy this equation ... why?
sin2a<1 then 2sina.cosa<1 so sina.cosa<1/2
4/7 is not less than 1/2 and equation is not true.
see the graph . . . . no roots possible; sin A cos A = 4/7. The red and blue wont meet . . . .
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