If 0 ≤ t < 0  π/2 and sin t = √39/ 8 is given. Use the Pythagorean identity sin2 t + cos2 t = 1 to find cos t.

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter8: Complex Numbers And Polarcoordinates
Section8.3: Products And Quotients In Trigonometric Form
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If 0 ≤ t < 0  π/2 and sin t = √39/ 8 is given. Use the Pythagorean identity sin2 t + cos2 t = 1 to find cos t.

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