f'(x)=15 sin15x+15cos15x (15x)=15sin15x+225xcos15x
f''(x)=225cos15x+225cos15x+(-15)sin15x (225x)=450cos15x-3375sin15x
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f'(x)=15 sin15x+15cos15x (15x)=15sin15x+225xcos15x
f''(x)=225cos15x+225cos15x+(-15)sin15x (225x)=450cos15x-3375sin15x