Answer:
j. 1st, 2nd and 3rd
Step-by-step explanation:
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The area of a rectangle is 60 sq. cm. The rectangle's length is 12 cm.
1 answer:
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cosx = +1/2 => x = +π/3 + 2kπ, where k is an integer or x = -π/3 + 2kπ, where k is an integer;
cosx = -1/2 => x = +2π/3 + 2kπ, where k is an integer or x = -2π/3 + 2kπ, where k is an integer;