Trigonometric Identities and Equations - SS3 Mathematics Past Questions and Answers - page 1
1
If \(x = \sin\theta\), simplify \(\frac{x}{\sqrt{1 - x^{2}}}\)
A
\(\cos^{2}\theta\)
B
\(\tan\theta\)
C
\(\sin\frac{\theta}{2}\)
D
\(\tan^{2}\theta\)
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2
Find the value of \(\theta\) between \(0{^\circ}\) and \(360{^\circ}\) satisfying the equation \(\cos^{2}\theta + 2\cos\theta + 1 = 0\)
A
\(0{^\circ}\)
B
\(180{^\circ}\)
C
\(360{^\circ}\)
D
\(0{^\circ}\) and \(360{^\circ}\)
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3
Without using tables, find the value of \(\tan{75{^\circ}}\) in surd form
A
\(\frac{2 + \sqrt{3}}{2 - \sqrt{3}}\)
B
\(\frac{2 - \sqrt{3}}{2 - \sqrt{3}}\)
C
\(\frac{2}{2 + \sqrt{3}}\)
D
\(\frac{2}{\sqrt{3}}\)
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4
Simplify \(2\sin{2A}\cos{2A}\)
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5
Without using tables, find the value of \(\cos{(120{^\circ} + 45{^\circ}})\) in surd form.
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