Question

Hello,

find the exact value of each of the following under the given conditions.

sin alpha=3/5, 0<alpha<pi/2 ; cos beta= (8sqrt113)/113, -pi/2<beta<0

(a) sin (alpha+beta)= -(4sqrt113)/565

(b) cos (alpha+beta)= (53sqrt113)/565

(c) sin (alpha-beta)= (52sqrt113)/565

(d) tan (alpha-beta)= ?

I got the answers for (a to c), the correct answers, but I couldn't get (d) correct. I got the answer 53/4 instead of 52/11, which is the correct answer for (d). I used the sum and difference formulas for each of them, yet I don't understand how 52/11 is the correct answer. Can you explain how it is 52/11?

Step 1

We have to find value of tan(alpha-beta).

Information is given below:

Step 2

We will use following formula.

Formula is given below:

Step 3

Now use pythagorean theorem to find remaining sides of right angle triangles with angle alpha and beta.

alpha in ...

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Sorry about that. What wasn’t helpful?