From the meaning of the question, the angle α is expressed by trigonometric function, and then H is expressed, thus y is obtained;

(2)40.5-40 cents

Pi?

six

T=60.5, so we get

Pi?

six

t=2kπ+

2

three

π or

Pi?

six

t=2kπ+

four

three

π，k∈N； rule

Pi?

six

t=2π+

four

three

π, and then find t.