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The expression cos-1 (3/5) has an infinite number of values. True or False? http://prntscr.com/n65c1h
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If 6 ΦcosΦ + 2 sin²Φ =5, show that tan²Φ - ⅓
If cosΦ = C, express in terms of C tan² Φ + 2 cos Φ
if a+b+c=pie then prove that cosa*cosa+cosb*cosb+cosc*cosc=1-2cosa*cosb*cosc
sinA+sin2A/1+cosA+cos2A=tanA
In the diagram shown to the right, you are given that the line containing A-E is parallel to the line containing B-D. Given that the length of A-C is 10cm, (this is denoted A-C= 10cm) and that. A-B = 5.5 cm and that C-D = 4.75 cm, determine the length of CE.
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