перетворіть на добуток
1)sin5L+sin3L
2)cos40*-cos10*
3)sinП/7-sin2П/7
СРОЧНО!!!
1)sin5L+sin3L
2)cos40*-cos10*
3)sinП/7-sin2П/7
СРОЧНО!!!
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Answers & Comments
Ответ:
sin5L+sin3L = 2sin4LcosL
cos40*-cos10* = 1/2(cos30*+cos50*) - 1/2(cos30*-cos50*) = sin50*-sin30* = 1/2sin60* = 1/4*sqrt(3)
sinП/7-sin2П/7 = 2cos3П/14sinП/14 = sinП/14/sin3П/14
Объяснение: