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18 January, 15:03

1. What basic trigonometric identity would you use to verify that cot x sin x = cos x? ...

a. cos^2x+sin^2x=1.

b. cot x = cosx/sinx.

c. cos x = 1/sec x.

d. sin x = 1/csc x ...

2. What basic trigonometric identity would you use to verify that sin^2x+cos^2x/cosx = sec x?.

a. sin x=1/csc x.

b. 1+cot^2x=csc^2x.

c. cos^2x+sin^2x=1.

d. cos x = 1/sec x

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Answers (1)
  1. 18 January, 15:14
    0
    1) cot x * sin x = cos x

    (cos x / sin x) * sin x = cos x

    cos x = cos x

    Answer: B) cot x = cos x / sin x

    2) (sin² x + cos² x) / cos x = sec x

    1/cos x = sec x

    sec x = sec x

    Answer: C) cos² x + sin² x = 1
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