Mathematics
Undergraduate
模範解答が分からないので解説と解答お願いします
次の等式を満たす : を求めよ.
1
-1
+ cos
期関 (1)
3
sin-! =
sin-1
ヒント
L
7
1
-1
= α, COS
3
sin cos で考えましょう.
● sin
=Bとおいて,
(5TN
sin(a + b) = sin a cos6 + cos a sinb
?t+ cos?t =1
7_9
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