Cos (45°-30°) cos 45° . cos 30° + sin 45° . 30° mohon bantuan nya ​

Cos (a-b) = cos a. cos b + sin a. sin b

Cos (45°-30°) cos 45° . cos 30° + sin 45° .sin 30°

= (cos 45° . cos 30° + sin 45°.sin30° ) cos 45° . cos 30° + sin 45°

= (½√2 . ½√3 + ½√2 . ½) ½√2 . ½√3 + ½√2

= ( ¼√6+¼√2) ¼√6 + ½√2

= ¼(√6+√2) ¼√6 + ½√2

Jawab:

0.59

Penjelasan dengan langkah-langkah:

cos left(45^{circ :}-30^{circ :}right)cos left(45^{circ :}right)cos left(30^{circ :}right)+sin left(45^{circ :}right)0.3^{circ :}

frac{cos left(45^{circ :}-30^{circ :}+45^{circ :}right)+cos left(45^{circ :}-30^{circ :}-45^{circ :}right)}{2}cos left(30^{circ :}right)+sin left(45^{circ :}right)0.3^{circ :}

frac{cos left(30^{circ :}right)left(cos left(60^{circ :}right)+cos left(-30^{circ :}right)right)}{2}+0.3^{circ :}sin left(45^{circ :}right)

frac{frac{sqrt{3}}{2}left(frac{1}{2}+frac{sqrt{3}}{2}right)}{2}+0.3^{circ :}cdot frac{sqrt{2}}{2}

frac{sqrt{3}+3}{8}+frac{sqrt{2}180^{circ :}}{1200}