程序代写代做代考 ENG6 WQ2016 Lab 1

ENG6 WQ2016 Lab 1

1. Calculate and then display using the disp() function:

a.
sin(

7𝜋

9
)

𝑐𝑜𝑠2(
5

7
𝜋)
+

1

7
tan (

5

12
𝜋)

b.
tan64°

𝑐𝑜𝑠214°

3 sin80°

√0.9
3 +

cos 55°

sin11°

2. Two trigonometric identities are given by:

a. sin 4𝑥 = 4 sin 𝑥 cos 𝑥 − 8𝑠𝑖𝑛3𝑥 cos 𝑥

b. cos 2𝑥 =
1−𝑡𝑎𝑛2𝑥

1+𝑡𝑎𝑛2𝑥

c. For each part, verify that the identity is correct by calculating the values of the left

and right sides of the equation, substituting 𝑥 = 𝜋 9⁄

3. Calculate the length of a in figure 1. (Hint: use law of cosines:

𝑎2 = 𝑏2 + 𝑐2 − 2𝑏𝑐 cos𝛼 )