Simplify to a single trigonomeiric ratio: cos(90°-x).cos(-y)- cos(180°-x)sin(-y). cos(360° -x).cos((y-360°)+sin(540° + x).cos(90° + y)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 19E
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5.6
Simplify to a single trigonomeiric ratio:
cos(90°-x).cos(-y)-cos(180°-x)sin(-y).
cos(360° – x).cos(y-360°)+sin(540° +x).cos(90° +y)
5.7
If cos x 2sin y cos y, 0°<y 90°, show that x+2y= 90°
Show that the equation
càn be written as
4sin?x + 9cosx-6=0
4cos2x-9cosx+2 0
5.8
Hence solve, for 0 <x< 680° 4sin2x + 9casx-6 0
Transcribed Image Text:5.6 Simplify to a single trigonomeiric ratio: cos(90°-x).cos(-y)-cos(180°-x)sin(-y). cos(360° – x).cos(y-360°)+sin(540° +x).cos(90° +y) 5.7 If cos x 2sin y cos y, 0°<y 90°, show that x+2y= 90° Show that the equation càn be written as 4sin?x + 9cosx-6=0 4cos2x-9cosx+2 0 5.8 Hence solve, for 0 <x< 680° 4sin2x + 9casx-6 0
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