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How do i solve this? sec^2x+2secx
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3 votes
How do i solve this?
sec^2x+2secx

User David Thornley
by
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1 Answer

6 votes
sec x = a

sec^2 x + 2sec x = 0

a^2 + 2a = 0

a(a + 2) = 0

a = 0 or a + 2 = 0

a = -2

i.e. sec x = -2
1/cos x = -2
-2cos x = 1
cos x = -1/2

Hope I helped!
User Adam Marshall
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6.2k points
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