Question

a) cos 30° cos 45º -
sin 30° sin 45°​

Answer 1

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cos 45º cos 30° +sin 45° sin 30°

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Answer 2

Step-by-step explanation:

we know ,

$\cos(30) = \frac{ \sqrt{3} }{2} \\ \cos(45) = \frac{1}{ \sqrt{2} } \\ \sin(30) = \frac{1}{2} \\ \sin(45) = \frac{1}{ \sqrt{2} }$

$( \frac{ \sqrt{3} }{2} \times \frac{1}{ \sqrt{2} }) - ( \frac{1}{2} \times \frac{1}{ \sqrt{2} } ) \\ \frac{ \sqrt{3} }{2 \sqrt{2} } - \frac{1}{2 \sqrt{2} } \\ \frac{ \sqrt{3 } - 1 }{2 \sqrt{2} } ans$

i hope it will help you..