A-Level Maths - Struggling with Trig?

Let’s change that.

Try this:

Solve:
2sin²x − 3sinx + 1 = 0 (0° ≤ x ≤ 360°)

• Step 1: Treat it like a quadratic
  Let sinx = y
  2y² − 3y + 1 = 0
• Step 2: Factorise
  (2y − 1)(y − 1) = 0
• Step 3: Solve
  sinx = 1/2 or sinx = 1
• Step 4: Find angles
  sinx = 1/2 → x = 30°, 150°
  sinx = 1 → x = 90°

Final answers: 30°, 90°, 150°

Key idea: Many trig problems are just algebra in disguise.

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