Is 2.5 hours equal to 2.5 hours Is 2.5 hours two and a half hours? If not, how many hours?

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• 6. Definition of acute triangle function
• 7. In RT △ ABC, ∠ C = 90 ゜, with the help of your two trigonometric rulers, according to the definition of acute trigonometric function, four trigonometric function values of ∠ a are obtained （1）∠A＝30゜ （2）∠A＝60゜ （3）∠A＝45゜.
• 8. Why can't cos (360-60) = cos (- 60) be equal to - cos60
• 9. Trigonometric function: cos45 ° / - tan45 ° - sin30 ° = - √ 2 / 2 / - 1-1 / 2, = √ 2 / 3, why does positive cos45 ° become negative?
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