1 The expression cos4x cos3x+sin4xsin3x is equivalent to 2.. The expression cos40cos10+Sin40sin10 is equivalent to 3. Cos 70cos 40 - sin70 sin40 is equivalent to 4. Which expression is equivalent to cosP cos 50-sinP sin50 5. Which expression is equivalent to sin22cos18+ cos22 sin18 6. The expression cos80cos20- sin80sin20 is equivalent to 7. Sin50cos30+ cos50 sin30 is equivalent to 8. The expression cos70 cos10+sin70sin10 is equivalent to 9. The expression cos80 cos70 + sin80 sin70 is equivalent to 10. The expression. sin80 cos70+cos80sin70 is equivalent to Angle Sum and Difference Identities 1 IF A and B are positive acute angles, sinA= 5/13, and cosB= 4/5. what is the value of sin(A+B)? z. If sinx=12/13,cosy=3/5, and x and y are acute angles, the valve of cos(x-y) is 8. If tan A=8 and fan B= , what is the value of tan(A+B)? a. If tan A= 7/3 and tan B=1/2, what is the value of tan(A+B)? 11. If tanA=2/3 and tanB= 3 express tan(A+ B) as a fraction in simplest form