Can U solve D same for
cos(B+C/2)
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Answer :
Trigonometry is the study of the ratios of angles and the interchanging of angles with their ratios happen.
RULE :
cos(A + B) = cosA cosB - sinA sinB
sin(A + B) = sinA cosB + cosA sinB
cos(A - B) = cosA cosB + sinA sinB
sin(A - B) = sinA cosB - cosA sinB
Now,
cos{(B + C)/2}
= cos(B/2 + C/2)
= cos(B/2) cos(C/2) - sin(B/2) sin(C/2)
Another one.
cos(B + C/2)
= cosB cos(C/2) - sinB sin(C/2)
#MarkAsBrainliest
Trigonometry is the study of the ratios of angles and the interchanging of angles with their ratios happen.
RULE :
cos(A + B) = cosA cosB - sinA sinB
sin(A + B) = sinA cosB + cosA sinB
cos(A - B) = cosA cosB + sinA sinB
sin(A - B) = sinA cosB - cosA sinB
Now,
cos{(B + C)/2}
= cos(B/2 + C/2)
= cos(B/2) cos(C/2) - sin(B/2) sin(C/2)
Another one.
cos(B + C/2)
= cosB cos(C/2) - sinB sin(C/2)
#MarkAsBrainliest
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