(a) Given that sin²+ cos²0= 1, show that 1 + tan²0= sec²0. (b) Solve, for 0≤ 0< 360°, the equation 2 tan 0+ sec 0 = 1, giving your answers to decimal place. 11. (a) Using the identity cos(A + B) = cosA cosB - sinA sinB, prove that cos 24 = 1-2 sin² A. 10.

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