AM-2462
Amplitude, period and symmetry
A Math · Secondary 4 · Hard · Amplitude, period and symmetry
Given that
tanθ=3cscθ, show that
cos2θ+3cosθ−1=0. Hence, find the exact value of
cosθ in simplest surd form, given that
0∘<θ<90∘.
- 2−3+13
- 23+13
- 2−3−13
- 23−13
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