Find a common denominator. for example the third question is 2/3-2/5. the common denominator would be 15 because both are divisible by 15. since you multiply three, 5 times to get 15 you multiply 2 by 5 which is ten (new fraction is 10/15). then the other is 2/5 so same thing with the other one it takes three fives to get to 15 so its 2 times 3 which is six (new fraction is 6/15) you have to qual out each side. 10/15-6/15 is 4/15
If you want to remember the trig formulas, I suggest the “SOHCAHTOA” or the “Some old hippie caught another hippie tripping on acid method.” It combines all three principle formulas together. So, SOH means sine equals opposite over hypotenuse, and CAH means cosine equals adjacent over hypotenuse, and TOA means tangent equals opposite over adjacent.
Cosine equals adjacent/hypotenuse.
Answer:
<em>therefore</em><em>,</em><em> </em><em> </em><em>option</em><em> </em><em>B </em><em>is </em><em>correct</em>
<em>hope </em><em>this </em><em>answer </em><em>helps </em><em>you</em><em> </em><em>dear.</em><em>.</em><em>.</em><em>take </em><em>care!</em>
