Question

2. Sí senX=5/7; cosY=4/7
Determine:
• Sen(x+y)
• Cos(x-y)
• Tang(x-y)
• Cos2x
• Tang2x • Senx/2

Answer 1

•Sen (9/7)
•Cos (1/7)
•Tang (1/7)
•Cos 2•5/7
2/1•5/7
2•5/1•7
10/7
Cos (10/7)
•Tang 2•5/7 • Sen 5/7/2
Tang(10/7)Sen(10/7)
Sen(10/7)
_______ •Sen(10/7)
Cos(10/7)

Sen(10/7) ²
________
Cos(10/7)