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Find the value of 4sin^2 10degree + 4sin^2 50 degree cos 20 degree + cos 80 degree Find the value of 4sin^2 10degree + 4sin^2 50 degree cos 20 degree + cos 80 degree
Transform first terms to cos using 2sin^2theta=cos2theta and then take cos 20 common. Again you can use cos2theta relation and finaly 2cosAcosB relation. In three steps youwill get the solution.
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