Given that $\cos 50^{\circ} = a$, express each of the following in terms of $a$. \(\sin 50^

Question

Given that $\cos 50^{\circ} = a$, express each of the following in terms of $a$. $\sin 50^{\circ}$ $\cos (-40^{\circ})$ $\tan 130^{\circ}$ $\sin 230^{\circ}$

Accepted Answer

(i) $\sqrt{1-a^2}$ (ii) $-\frac{\sqrt{1-a^2}}{a}$ (iii) $\sqrt{1-a^2}$ (iv) $-\sqrt{1-a^2}$

Trigonometry - Symmetry of Trigonometric Functions

Trigonometry - Symmetry of Trigonometric Functions

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