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cos 2x 2cos x 2senx2 2 2i = cos2x cosx senxi = cos2x tgx= 2 2 1 tg x tgx 1 tg x − = + 1 tgx tgx tgx= + +2 3 1= E RPTA.: D 18. Reducir G = 2 2 4 6 4tg 1 tg 2sec sec θ − θ θ− θ A) sen4 θ B) sen2 θ C) cos2 θ D) cos4 θ E) sen42 θ RESOLUCIÒN 2 2 4 2 4tg 1 tg 1 tg G sec 2 sec θ − θ − θ = θ − θ ( ) ( ) 2 2 2 2 2 4tg 1 tg 1 ... ................
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