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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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