How do you find inverse trig functions without calculator?

1 Answer
Hriman
Mar 28, 2018

See below

Explanation:

#3# rules:

  • #(1)# Know that #cos#, #sec# functions are restricted to quad #1# and #2#
  • #(2)# Know that #tan#, #cot#, #sin#, #csc# are restricted to quad #1# and #4#
  • #(3)# And when you go to quadrant #4# with #tan#, #cot#, #sin#, #csc#, use negative angles

1) #arcsin(1)= pi/2#
2) #arctan(-1)= -pi/4#
3) #arcsec(1/2)= DNE#
4) #arc csc (-sqrt2)= -pi/4#

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