" 13."8-4a-2a^(3)+a^(4)

factorise :8-4a-2a^(3)+a^(4)

1-(1)/(4)+(1.3)/(4.8)-(1.3.5)/(4.8.12)+…..=

Find the value of: (i) (-4) -: 2/3 (ii) (-3)/5 -: 2 (iii) (-4)/5 -: (-3) (iv) (-1)/8 -: 3/4 (v) (-2)/(13) -: 1/7 (vi) (-7)/(12) -: ((-2)/(13)) (vii) 3/(13) -: ((-4)/(65))

Find the value of: (i) (-4) -: 2/3 (ii) (-3)/5 -: 2 (iii) (-4)/5 -: (-3) (iv) (-1)/8 -: 3/4 (v) (-2)/(13) -: 1/7 (vi) (-7)/(12) -: ((-2)/(13)) (vii) 3/(13) -: ((-4)/(65))

8^(2.4)xx2^(3.7)xx-(16)^(1.3)=2^(?)4.8b.5.7c3.2d.3.6e. none of these

Show that the three lines with direction cosines quad (12)/(13),(-3)/(13),(-4)/(13),(4)/(13),(12)/(13),(3)/(13);(3)/(13),(-4)/(13),(12)/(13) are mutually perpendicular.

Show that the three lines with direction cosines (12)/13, (-3)/13, (-4)/13 ;(4)/13, (12)/13, (3)/13; (3)/13, (-4)/13, (12)/13 are mutually perpendicular.

Find : a. 4 (5)/(13)- 3 (7)/(13) + 2 (8)/(13)

Show that + 1/4 + (1.3)/(4.8) + (1.3.5)/(4.8.12) + …….= sqrt2