Asked by Elle
Verify the identity.
1/(tanx-secx) + 1/(tanx+secx) = -2tanx
1/(tanx-secx) + 1/(tanx+secx) = -2tanx
Answers
Answered by
Steve
recall that
(a-b)(a+b) = a^2-b^2
sec^2(x) - 1 = tan^2(x)
put the fractions over a common denominator and watch the answer fall out.
(a-b)(a+b) = a^2-b^2
sec^2(x) - 1 = tan^2(x)
put the fractions over a common denominator and watch the answer fall out.
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