Question

cos(5π/2 - 19π/3) = ?​

Answer 1

Answer:

√3/2

Step-by-step explanation:

cos{(5r/2)-(19r/3)} = cos(-13r/6) = cos(13r/6) = cos{(12r/6)+(r/6)} = cos{(4*r/2)+(r/6)} = cos(r/6) = (root3)/2

I hope it will help you

Answer 2

5π/2 = 450⁰ = 90⁰

19π/3 = 1140⁰ = 60⁰

cos(90⁰+60⁰) = cos150⁰ = sin 30⁰ = 1/2 or 0.5

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