Question

sin 73° cos 17° + cos 73° sin 17°=1

Answer 1

sin 73°cos17°+cos73°sin17°
= sin(73°+17°)
=sin90°
=1

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Answer 2

$\sin(73) = \cos(17) \\ \\ \cos(73) = \sin(17) \\ \\ \\ s \: o \\ as \: we \: put \: values \: in \: eqution \\ \\ \\ \\ \sin(17) {}^{2} + \cos(17) {}^{2} \\ \\ = 1 \\ because \: (sin \: a) {}^{2} + (\cos \: a) {}^{2} = 1$