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Answer on Trigonometry Question for Muammar Mubin

Question #14778
Given that cos a 12/3 and a is an angle in Quadrant II and that sin Beta = 3/5 is an angle in Quadrant I. Determine

a) cos (a + Beta)

b) sin (Beta - a)
Expert's answer
Incorrect conditions. "Given that cos a 12/3..." What does it mean? If that cos a = 12/3, then it's impossible, because cos (in real analysis) is bounded
function and its value are in [-1;1], but 12/3 = 4, which is bigger than

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