OpenStax, Algebra and Trigonometry 2e §9.2 Sum and Difference Identities · Example 6 · Trigonometry · Compound & multiple angles

Finding Multiple Sums and Differences of Angles

Given $s in α = \frac{3}{5}, 0 < α < \frac{π}{2}, cos β = - \frac{5}{13}, π < β < \frac{3 π}{2},$ find

ⓐ $s in (α + β)$
ⓑ $cos (α + β)$
ⓒ $t an (α + β)$
ⓓ $t an (α - β)$

Its source prints no answer for this problem, so there's nothing to check against.

~5 minWritten answer · compare with the solution

OpenStax, Algebra and Trigonometry 2e · §9.2 Sum and Difference Identities · Example 6

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your working

Check your full solution

Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.