Discover Questions

I'm having the hardest time with this question. Can I please get some help on this one.? Which of the following statements is true?
a.
sin 30° = cos 30°
b.
sin 35° = cos 55°
c.
sin 60° = cos 60°
d.
sin 55° = cos 25°? Un bois mesuranr 30cm x 4cm avec une longueur de 6m mesure combien de tonne svp? Given cos(α)=58 and α is in quadrant I, find the exact value of cos(α/2).? 520 is 32 percent of what number? (Please show work)?