Question

cos75
find the value?​

Answer 1

Heya mate here is your answer :
1 / root 2
Hope it helps you mate...
Regards !!!

Answer 2

Find the value of cos $45^{\circ}$

Step-by-step explanation:

$\ Given \ value:\\\\\cos 45^{\circ}\\\\\ Solution:\\\\\ formula: \\\\\cos(A+B) \ = \cos A \cdot \cos B- \sin A \sin B\\\\\cos(45+30) =\cos 45^{\circ} \cdot \cos 30^{\circ}- \sin 45^{\circ} \sin 30^{\circ} \\\\\rightarrow \frac{1}{\sqrt{2}}\cdot \frac{\sqrt{3}}{2} - \frac{1}{\sqrt{2}} \cdot \frac{1}{2}\\\\\rightarrow \frac{\sqrt{3}}{2\sqrt{2}} - \frac{1}{2\sqrt{2}} \\\\\rightarrow \frac{\sqrt{3}-1}{2\sqrt{2}}$

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