Answer to Question #9684 in Trigonometry for Eliana Hernandez
sin α = 4/5, α lies in quadrant II cos β = 5/13, β lies in quadrant I find the exact value of the following 1. cos (α + β) 2. tan (α - β) 3. sin 2α 4. cos β/2 verify each identity 9. cos (θ + (π/2)) = -sinθ 10. (sin (α - β))/(sin α cos β) = 1 - cot α tan β 11 sin t cos t(tan t + cot t) = 1
Unfortunately, your question requires a lot of work and cannot be done for free. Submit it with all requirements as an assignment to our control panel and we'll assist you.
Everything works, thank you (Operator and Expert) so much! I will bookmark this page for future reference. Excellent job on the comments to by the way, now I can study and understand what is happening for the future!