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anonymous
 one year ago
Precalculus: At a certain time of day, a 15meter mast casts a 20 meter shadow. What is the angle of elevation of the sun?
anonymous
 one year ago
Precalculus: At a certain time of day, a 15meter mast casts a 20 meter shadow. What is the angle of elevation of the sun?

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Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1use the trig ratio to find x \[\rm sin \rm \theta = \frac{ opposite }{ hypotenuse }~~~~ \cos \theta = \frac{ adjacent }{ hypotenuse } ~~\tan \theta = \frac{ opposite }{ adjacent }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nnesha So I'm doing tan because I know that the opposite is 15, and the adjacent is 20? And that's my answer? 15/20?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1yes right then use the calculator to find the exact value

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got .75, is that correct? @Nnesha

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1remember you should inverse tan \[\huge\rm tan( x) =\frac{ 15 }{ 20 }\] \[x= \tan^{1} \frac{ 15 }{ 20 }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nnesha So the cotangent....? Sorry I just started precalc last week so I'm not sure how to do that.

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1tan and cot are `reciprocal` not inverse use the calculator to find inverse tan

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nnesha So tan(15/20) in the calculator?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1not tan inverse tan which calculator are u using google or ti84 ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nnesha Oh I figured it out! The final answer is 36.9. Do you mind explaining why I have to find the inverse?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1yes that's right tan and invs are opposite like when you have to find side then you should apply tan and when you have to find `an angle ` then you should use invs tan

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1i found this from mathisfun website http://prntscr.com/8e6m50

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1https://www.mathsisfun.com/algebra/triginversesincostan.html

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nnesha Thank you SO much. Your help was amazing!

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1np glad it helped goood work btw! keep it up!
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