About Lesson
(1) Prove the following identities
证明下列恒等式
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(2)
If , and ; find without using calculator or tables, the values of
若, 和 ; 不用计算机或查表,求
(a)
(b)
(c)
Answer 答案:
(a)
(b)
(c)
(b)
(c)
(3)
Given that , find the values of a, b and c.
已知 , 求 a, b 和 c的值.
Given that , find the values of a, b and c.
已知 , 求 a, b 和 c的值.
Answer 答案:
, ,