Answer to Question #9684 in Trigonometry for Eliana Hernandez

Question #9684
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
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