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cos12-sin78

Guest Sep 14, 2014

Best Answer 

 #3
avatar+92775 
+10

It was cluey for you to notice that Chris.     

 

Complementary angles are angles that add up to 90.

Complementary trig ratios are ones where the values are equal for complementary angles.

I am probably not wording that very well.

Cosine stands for complementary ratio of sine   (at least that is how I think of it)

     Cosine(theta)=sine(90-theta)

Cotangent stands for complementary ratio of tan

     Cot(theta)=tan(90-theta)

Cosec stands for complementary ratio of sec

     cosec(theta)=sec(90-theta)

 

If you remember this it can help a lot.    

Melody  Sep 14, 2014
 #1
avatar+26750 
+5

Just use the calculator on the home page here.  http://web2.0calc.com/ 

Alan  Sep 14, 2014
 #2
avatar+87294 
+10

We don't really need to use any calculators here.......

Notice that cosA = sin(90 - A)

So

cos 12  = sin(90 - 12)

cos12  =  sin 78

And, if like things are subtracted, the answer  = 0 !!!!

 

CPhill  Sep 14, 2014
 #3
avatar+92775 
+10
Best Answer

It was cluey for you to notice that Chris.     

 

Complementary angles are angles that add up to 90.

Complementary trig ratios are ones where the values are equal for complementary angles.

I am probably not wording that very well.

Cosine stands for complementary ratio of sine   (at least that is how I think of it)

     Cosine(theta)=sine(90-theta)

Cotangent stands for complementary ratio of tan

     Cot(theta)=tan(90-theta)

Cosec stands for complementary ratio of sec

     cosec(theta)=sec(90-theta)

 

If you remember this it can help a lot.    

Melody  Sep 14, 2014
 #4
avatar+87294 
0

Well....I DO have my "moments".......(every now and then) (LOL!!!)

 

CPhill  Sep 14, 2014
 #5
avatar+92775 
0

Yes you have your clever moments very often.   

Melody  Sep 14, 2014
 #6
avatar+87294 
0

Yeah...even if Alan and I disagree about how long it takes for 62 apples to fall off a tree.....I was assuming that the first apple was "on the fence" about the whole thing and it took him/her almost 3 hrs. to decide to take the "plunge"  ...........either way, it's either 7.2 days or 7.3 days.......depending upon your local time zone and prevailing gravitational conditions, of course.......!!!

 

 

CPhill  Sep 14, 2014
 #7
avatar+92775 
0

Yea apples are fickled things - they fall with the wind.     LOL

Melody  Sep 14, 2014
 #8
avatar+26750 
0

Well spotted Chris!

Alan  Sep 14, 2014
 #9
avatar+92775 
0

Alan, do you like classical music?

I'm enjoying this.

http://www.youtube.com/watch?v=GAkw_Wi4yIo

Melody  Sep 14, 2014

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