Prove that
=
=
=
=
=
Using the formula,
cosA - cosB = -2sin
sin
cosA + cosB = 2cos
cos
AI is thinking…
Couldn't generate an explanation.
Generated by AI. May contain inaccuracies — always verify with your textbook.
15. Trigonometric, or Circular, Functions
1
2
3
4
5
6
7
8 A
8 B
8 C
8 D
8 E
8 F
9
9
9
9
9
9
10
10 B
10 C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27 A
27 B
27
1 A
1
1 C
2 A
2
2
3 A
3
3
4
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 A
18
18 C
18 D
19 A
19 B
20
21
1
2
3
4
5
6
7
8
9
10
Report submitted
Thank you — our team will review your report shortly.