Докажите тождества
[tex] \frac{sina+sinb}{sina*cosb+cosa*sinb}= \frac{cos \frac{a-b}{2} }{cos \frac{a+b}{2} } [/tex]
[tex] \frac{sina+sinb}{sina*cosb+cosa*sinb}= \frac{cos \frac{a-b}{2} }{cos \frac{a+b}{2} } [/tex]
More Questions From This User See All
Answers & Comments
Verified answer
Формулы: