find the value of f(1) when?

Question

f(x)= 3sin^-1x+5tan^-1x

Answer 1

sin^-1(1) = pi/2
tan^-1(1) = pi/4

f(1) = 3*pi/2 + 5*pi/4
f(1) = 11pi/4

Answer 2

f(1) = 3 sin^-1 (1) + 5 tan^-1 (1)

now, go get a calculator, find out that sin^-1 (1) = 90

and tan^-1 (1) = 45

then work out what 3x 90 is and 5x 45 and add em up.
well done.
that wasn't too hard was it!

what, don't you have a calculator, you want me to breathe for ya too!

Answer 3

f(x)=3 arcsinx+5 arctan x
f(1)=3*90+5*45
=270+225
=495 degrees.ANS