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1.7.21 Use identities to solve equations (A-level only)
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Solve, for
−180≤x≤180-180 \leq x \leq 180
−
180
≤
x
≤
180
, the equation,
cos2x+3cosx−1=0 \cos 2x + 3 \cos x - 1 = 0
cos
2
x
+
3
cos
x
−
1
=
0
[5]
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1.7.21 Use identities to solve equations (A-level only) Questions
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1.7.21 Use identities to solve equations (A-level only)
