find exact value unless approximations are indicated 2sin2 p

find exact value unless approximations are indicated. 2sin^2 *pi *cos pi/4=???

and cos (sin^-1(15/17)=???

ated. If no answer is possible, state why b. tan l) (in degrees) cos sin tos f. cos n 180o) n radians) h. sin cos 15 j. cos sin 17 1. arcsec (2.5) in radians ap- proximate to 4 decimal places) t), where d is expressed ininches and is in seconds.

Solution

2 sin²pi cos² pi/4

sin pi=0

Therefore 2 sin²pi cos²pi =0

j.     cos(sin^-1(15/17))

Let sin^-1(15/17)=t

   sin t=15/17

opposite=15    and    hypotenuse=17

adjacent=sqrt(17²-15²) = 8

cos t= adjacent / hypotenuse= 8/17

Therefore   cos (sin^-1(15/17))=8/17