Edexcel C3 — Question 1

Exam BoardEdexcel
ModuleC3 (Core Mathematics 3)
TopicReciprocal Trig & Identities
  1. Given that
$$x = \sec ^ { 2 } y + \tan y ,$$ show that $$\frac { \mathrm { d } y } { \mathrm {~d} x } = \frac { \cos ^ { 2 } y } { 2 \tan y + 1 } .$$
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