How does sin(c+h)=sin(c)xcos(h)+cos(c)xsin(h) please explain

use law of cosines to show that theta equals inverse cosine of (a^2 + b^2 -484)/(2ab) where a^2=(7+xcos a)^2 + (28-xsin a)^2 and
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2. asked by Lisa
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Can you show us how to use law of cosines to show that theta equals inverse cosine of (a^2 + b^2 -484)/(2ab) where a^2=(7+xcos
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2. asked by Lisa
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How doessin(c+h)=sin(c)xcos(h)+cos(c)xsin(h) please explain
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2. asked by xX_Supaman_Xx
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I've been told thatsin(c+h)=sin(c)xcos(h)+cos(c)xsin(h) but how? please explain
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2. asked by xX_Supaman_Xx
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∫xcos(2x)dxWhat I did wrong u=x du=dx dv=cos(2x)dx v=-sin(2x)/2 -xsin(2x)/2 +∫sin(2x)/2dx--> -xsin(2x)/2 -cos(2x)/4+C
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2. asked by Anonymous
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Which expression is equivalent to tan(-x)cos^2x?-sin xcos x sin xcos x tan x + sin2x tan x − sin2x -tan x − sin2x
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2. asked by jimmy
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ydy+xe^xcos^2ydx=0
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The derivative of xCos(5x)
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integral (xsin^2(x))dx
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2. asked by mi
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integrate xsin(2x)dx=
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2. asked by bob
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