Calculation of trigonometric function of acute angle In this lesson, I didn't come. The teacher left my homework. I'll go to class later. 1. Calculate the sine, cosine and tangent of the two acute angles in the following right triangle. 2. In RT △ ABC, if the length of each side is doubled, what's the change of the sine, cosine and tangent of the acute angle a? 3. As shown in the figure, in RT △ ABC, angle c = 90 °, AC = 8, Tana = 3 / 4, calculate the value of sina and CoSb If I can't send the pictures of question 1 and question 3, just answer the answers of question 2

Calculation of trigonometric function of acute angle In this lesson, I didn't come. The teacher left my homework. I'll go to class later. 1. Calculate the sine, cosine and tangent of the two acute angles in the following right triangle. 2. In RT △ ABC, if the length of each side is doubled, what's the change of the sine, cosine and tangent of the acute angle a? 3. As shown in the figure, in RT △ ABC, angle c = 90 °, AC = 8, Tana = 3 / 4, calculate the value of sina and CoSb If I can't send the pictures of question 1 and question 3, just answer the answers of question 2

2. In RT △ ABC, if the length of each side is increased by 2 times, then the sine, cosine and tangent of acute angle a remain unchanged; reason: if the length of each side is increased, the two triangles are similar, that is to say, the size of the corresponding angle remains unchanged, so the trigonometric function value remains unchanged
3. AC = 8, Tana = 3 / 4, so BC = 6, we can get that the hypotenuse of this right triangle is ab = 10, so Sina = BC / AB = 3 / 5, CoSb = BC / AB = 3 / 5