[cos((1)/(2)cos^(-1)(1)/(8))=......],[[" (a) "(3)/(4)," (b) "(-3)/(4)," (c) "(1)/(4)," (d) "-(1)/(4)]]

The value of cos((1)/(2)cos^(-1)((1)/(8))) is (a) (3)/(4) (b) -(3)/(4)( c) (1)/(16)(d)(1)/(4)

The value of cos(1/2cos^(-1)(1/8)) is (a) 3/4 (b) -3/4 (c) 1/(16) (d) 1/4

The value of cos(1/2cos^(-1)(1/8)) is (a) 3/4 (b) -3/4 (c) 1/(16) (d) 1/4

The value of cos(1/2cos^(-1)(1/8)) is (a) 3/4 (b) -3/4 (c) 1/(16) (d) 1/4

cos^(-1) (cos 8pi/5)

If z^(7)+1=0 then cos((pi)/(7))cos((3 pi)/(7))cos((5 pi)/(7)) is (A)(1)/(8) (B) -(1)/(8)(C)(1)/(2sqrt(2))(D)(1)/(2)

cos^(-1)(8/17)-cos^(-1)(5/13)=

cos4A=1-8cos^(2)A+8cos^(4)A

If quad Tan^(-1)(1)+cos^(-1)(-(1)/(2))+sin^(-1)(-(1)/(2)) and y=cos[(1)/(2)cos^(-1)((1)/(8))] then

Show that (i) sin^(8)A-cos^(8)A=(sin^(2)A-cos^(2)A)(1-2sin^(2)A.cos^(2)A) (ii) (1)/(sec A-tan A)-(1)/(cos A)=(1)/(cos A)-(1)/(sec A + tan A)