Question

urgent
cosinus 45+ sinus 60
cosinus 30× cosinus 60 - sinus 30 × cosinus 60​

Answer 1

Explicație pas cu pas:

• cosinus 45+ sinus 60 = $\frac{\sqrt{2} }{2} + \frac{\sqrt{3}}{2}$

• cosinus 30× cosinus 60 - sinus 30 × cosinus 60​=

cos 60° =  1/2,

cos 30° =  √3/2,

sin 60° =  √3/2,

sin 30° = 1/2

(1/2 × √3/2) + (√3/2 × 1/2)

= √3/4 + √3/4

= 2√3/4

= √3/2

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