A curve has equation $$$y=3 \cos 2 x+2$$$ for $$$0 \leqslant x \leqslant \pi$$$. State the greatest and least values of $$$y$$$. .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... ....................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_w20_qp_12 Year：2020 Question No：11(a)

Answer:

$5,-1$

1.5.1 sketch and use graphs of the sine, cosine and tangent functions (for angles of any size, and using either degrees or radians)

1.5.2 use the exact values of the sine, cosine and tangent of 30°, 45°, 60°, and related angles