8. If sin x+sin 3x sin xsin 3x then x = 4 TO TT 1),neZ 2)...

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8. If sin x+sin 3x sin xsin 3x then x = 4 TO TT 1),neZ 2) 2nt+;ne Z 3) nTt; nE Z 4) nt + (-1)";ne 9. The trigonometric equation sin2x+sin3x+ sin 4x+..+ sin nx = n-I (n is a natural number g than 2) 1) has unique solution for any n 2) has no solution for any n 3) has infinite solutions 4) has no solution in [2,nt]. 10. Number of solutions of the equation tanx + tan2x +tan3x tanx tan2x tan3x, xE[0.] is. TO 2T 2) 3 3 TT 2T TT TO 1) 3) ,2n 4) 2'2 T , TC 6 3 3 2 8. If sin x+sin 3x sin xsin 3x then x = 4 TO TT 1),neZ 2) 2nt+;ne Z 3) nTt; nE Z 4) nt + (-1)";ne 9. The trigonometric equation sin2x+sin3x+ sin 4x+..+ sin nx = n-I (n is a natural number g than 2) 1) has unique solution for any n 2) has no solution for any n 3) has infinite solutions 4) has no solution in [2,nt]. 10. Number of solutions of the equation tanx + tan2x +tan3x tanx tan2x tan3x, xE[0.] is. TO 2T 2) 3 3 TT 2T TT TO 1) 3) ,2n 4) 2'2 T , TC 6 3 3 2