CAIE IGCSE Mathematics Trigonometric Equations

Review CAIE IGCSE Mathematics trigonometric equations through sin, cos and tan solutions over 0° to 360°, including quadrant and graph methods.

Exam points

solve sin, cos or tan equations over 0° to 360° and list every angle in range
use quadrant relationships such as sums of 180, 360 or 540 degrees to check solutions
solve graph-based trigonometric equations by drawing a line and reading intersections

[Maximum number: 3]

Solve $4 \sin x-1=2$ for $0^{\circ} \leqslant x \leqslant 360^{\circ}$ .
x= and x=

48.6 or 48.59 to 48.60 and 131.4 or 131.40 to 131.41
B2 for one correct value, or M1 for $\sin x=0.75$ or better.
If 0 scored, SC1 for two answers adding to 180.

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E6.4.2 Trigonometric equations question 1