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If $\sin{61^{\circ}} = \sqrt{a}$ , determine the value of the following in terms of a: cos73°cos15° + sin 73°sin15°
in Grade 12 Maths by Bronze Status (8.4k points) | 13 views

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use compound angle identity

=cos(73 - 15)

= cos 58, use double angle, = cos2(29) =2cos29^2 - 1

                                                                = 2 sin 61^2 - 1

                                                               = 2.(a) - 1

                                                                =2a-1
by Silver Status (28.5k points)

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