Question: Application: (10 marks) 7) Given tan 170, use the related acute to determine an equivalent expression. (2) 8) Prove the trigonometric identity cos x- sin

Application: (10 marks) 7) Given tan 170, use the related acute to determine an equivalent expression. (2) 8) Prove the trigonometric identity cos x- sin x = 2cos' x-1 (2) Page 2 of 4 9) A triangular plot of land is enclosed by a fence. One side of the fence is 45.3 m long and an adjacent side of the fence is 29.0 m long. The inclusive angle between the two sides is 260. Determine the third side of the fence to the nearest tenth of a metre. (2] 10) Determine the value of x to the nearest cm. [4) E 65 52 cm 115 c 70"

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