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90. Trigonometrik funksiyalar yig'indisi va ayirmasi uchun formulalar — JAYDARIMOCK
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Trigonometriya
90. Trigonometrik funksiyalar yig'indisi va ayirmasi uchun formulalar
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1.
Qiyin
Agar
ctg
3
,
5
=
a
bo'lsa,
cos
5
+
cos
7
+
cos
9
sin
5
+
sin
7
+
sin
9
ni hisoblang.
A)
a
2
−
1
2
a
B)
a
2
−
1
a
C)
2
a
a
2
−
1
D)
2
a
a
2
+
1
Javobni tekshirish
Yechim tahlili
Oldingi
Keyingi
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