SOLUTION: If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)= cos(α−β)= (Your answers shou

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Question 1112992: If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of
cos(α+β)=
cos(α−β)=
(Your answers should be accurate to 4 decimal places.)
Answer by ikleyn(52813)   (Show Source): You can put this solution on YOUR website!
.
You can find MANY SIMILAR SOLVED PROBLEMS in the lessons
    - Calculating trigonometric functions of angles
    - Advanced problems on calculating trigonometric functions of angles
    - Evaluating trigonometric expressions
in this site. 

    The idea is very simple: having given values of the trig functions, you can and you must calculate values of co-functions; 
    then apply the addition or subtraction trigonometric formulas/identities.


    I think it is totally enough to see ONE TIME how to do it.
    After that anyone can solve similar examples on his/(her) own.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Trigonometry: Solved problems".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.



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