May 25th, 2019, 02:39 PM  #1 
Member Joined: Jan 2019 From: tornto Posts: 48 Thanks: 0  Tan inverse
1) if tanC= 0.6687 find C to the nearest degree C? MY ANSWER 33.77064668 OR SHOULD IT BE 33.80 2) COS 59 = X/36 X = (COS 59)* (36) = 18.5713707 CORRECT?? 3) sin 25= 34/x x= (sin 25) * (34) = 14.3690209 correct ??? thanks Last edited by yorkmanz; May 25th, 2019 at 02:52 PM. 
May 25th, 2019, 03:15 PM  #2  
Math Team Joined: May 2013 From: The Astral plane Posts: 2,266 Thanks: 934 Math Focus: Wibbly wobbly timeywimey stuff.  Quote:
Dan  
May 25th, 2019, 03:32 PM  #3  
Member Joined: Jan 2019 From: tornto Posts: 48 Thanks: 0  Quote:
So my answer like that tanC =  0.6687 tanC IS NEGATIVE SO MY ANSWER SHOULD BE BETWEEN 90180 tan(90+A) = tanA tanC = tan(90+A) = 0.6687 tan(90+A) = tanA tanA = 0.6687 remove negatives A = tan^(1) 0.6687 A = 33.77 C = 90+33.77 = 123.77 degree CORRECT????  
May 25th, 2019, 03:37 PM  #4 
Member Joined: Jan 2019 From: tornto Posts: 48 Thanks: 0 
for question 3) 3) sin 25= 34/x sin5= .423 .423=34/x .423x=34 x=34/.423 x=80.37 correct? 
May 25th, 2019, 05:05 PM  #5  
Global Moderator Joined: Dec 2006 Posts: 20,966 Thanks: 2216  No. cos(59$^\circ\!$)*36 = 18.5413707 (approximately). That's incorrect. As tan(180$^\circ\!$  C) = tan C, you want 180$^\circ\!$  33.77$^\circ\!$... = 146.23$^\circ\!$ approximately (or 146$^\circ\!$ if rounded to the nearest degree). Quote:
sin(25$^\circ\!$) = 0.42261826174... so x = 34/0.42261826174... = 80.450853827... = 80.45 approximately.  

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