EM-3088

Trigonometric ratios

E Math · Secondary 4 · Hard · Trigonometric ratios

In triangle

XYZ

XY = 7.5\text{ cm}

YZ = 6\text{ cm}

and

XZ = 4.5\text{ cm}

. Point

W

lies on the extension of

ZY

beyond

Y

so that

ZYW

is a straight line.

Without calculating any angle, find the value of

\cos \angle WYX

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