Question

v) cos2A -cos 2B + cos 2C
= 1-4sin Acos B sin C​

Answer 1

Answer:

simplify sin (-11π÷3) tan (35π÷6) sec (-7π÷3) cos (5π÷4) cosec (7π÷4)cos(17π÷6)

Step-by-step explanation:

simplify sin (-11π÷3) tan (35π÷6) sec (-7π÷3) cos (5π÷4) cosec (7π÷4)cos(17π÷6)