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Official 2022 Paper 1 · Q16

Paper 1Trigonometry

The solutions to 7x4−6x2+1=07x^4-6x^2+1=0 are ±cos⁡θ\pm\cos\theta and ±cos⁡β\pm\cos\beta.

Which one of the following equations has solutions ±sin⁡θ\pm\sin\theta and ±sin⁡β\pm\sin\beta?

A7x4−8x2−5=07x^4-8x^2-5=0
B7x4−8x2+2=07x^4-8x^2+2=0
C7x4−6x2−2=07x^4-6x^2-2=0
D7x4−6x2+1=07x^4-6x^2+1=0
E7x4+6x2−1=07x^4+6x^2-1=0
F7x4+6x2+5=07x^4+6x^2+5=0

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