Question

find the value sec(-420)

Answer 1

$\sec( - 420) = \sec(420) \\ = \sec(450 - 30 ) \\ = \sec( \frac{5\pi}{2} - 30 ) \\ \ = csc(30) \\ = 2$
Here's the solution

Answer 2

Answer:

-2

Step-by-step explanation:

-sec(90×4+60)

-cosec(60)

-2

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