[" The the "],[[" (a) "90^(@)+(x^(8))/(2)," (b) "90^(@)-(x^(0))/(2)," (c) "180^(@)+(x^(0))/(2)," (d) "180^(@)-(x^(0))/(2)]]

The bisects of exterior angles at B and C of triangle A B C meet at O . If A=x^@, then B O C= (a) 90^0+(x^0)/2 (b) 90^0-(x^0)/2 (c) 180^0+(x^0)/2 (d) 180^0-(x^0)/2

The bisects of exterior angles at B a n d C of /_A B C meet at Odot If /_A=x^0, then /_B O C= 90^0+(x^0)/2 (b) 90^0-(x^0)/2 180^0+(x^0)/2 (d) 180^0-(x^0)/2

(d)/(dx)cos x^(0) = (A) -sin x^(0) (B) -(pi)/(180)sin x^(0) ( C) (pi)/(180)sin x^(0) (D) (2 pi)/(180)sin x^(0)

cos e c(360^0)/7+cos e c(540^0)/7= (a) cosec(180^0)/7 ,(b) cosec(90^0)/7 , (c) sec(180^0)/7 , (d) sec(90^0)/7

" If "cos A=-(3)/(5),sin B=(7)/(25)" and "90^(@)

The number of degrees in 2 right angles is 90^(@) (b) 180^(0)(c)270^(0)(d)360^(0)

The measure of the angle between the coordinate axes is 0^(0)( b) 90^(0)(c)180^(@)(d)360^(@)

If 4cos^(2)x^(@)-1=0 and 0 le x^(@) le 90^(@) , find : 1/(cos^(2)x^(@))-tan^(2)x^(@)

If 4cos^(2)x(@)-1=0 and 0 le x^(@) le 90^(@) , find : 1/(cos^(2)x^(@))-tan^(2)x^(@)

If 4cos^(2)x^(@)-1=0 and 0 le x^(@) le 90^(@) , find : sin^(2)x^(@)+cos^(2)x^(@)