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∫cosxcosx/2dx
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∫cosxcosx/2dx
▼优质解答
答案和解析
记 cosx/2=t
∫cosx*cosx/2 dx
=∫(2t^2-1)t dx
=2*2∫t^3 dx/2 -2*∫t dx/2
=4(1/3*cos^2t*sint+1/3*sint*cost+1/3sint)
-2sint+C
=4/3*cos^2x/2*sinx/2+4/3*sinx/2*cosx/2
-2/3sinx/2+C
∫cosx*cosx/2 dx
=∫(2t^2-1)t dx
=2*2∫t^3 dx/2 -2*∫t dx/2
=4(1/3*cos^2t*sint+1/3*sint*cost+1/3sint)
-2sint+C
=4/3*cos^2x/2*sinx/2+4/3*sinx/2*cosx/2
-2/3sinx/2+C
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