cos2a+cos2b please solve this
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Answer:
2cos ( a+b) cos (a-b)
Step-by-step explanation:
cosC +cosD =2cos (C+D)/2 cos (C-D)/2
use this formula
rajendrarana54:
cos2c+cos2(a+b+c) please solve it
why u reported
i don't know how to solve
use the formula i write of cosC+cosD
ok
put C=2c and D= 2(a+b+c)
cos c+cosd=2cos(c+d).cos(c-d)
how please solve
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