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3.4 Trigonometry (A-level only)

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Question 43
a.

When x x\,x is small, show that tan⁡(2x)cos⁡(5x)\tan(2x) \cos(5x)tan(2x)cos(5x) can be approximated by 2x−25x32x - 25x^32x−25x3

[3]
b.

Hence, approximate the value of tan⁡(0.1)cos⁡(0.25)\tan(0.1) \cos(0.25)tan(0.1)cos(0.25)

[2]
c.

Calculate the percentage error in your approximation

[1]

3.4 Trigonometry (A-level only) Questions

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