How to simplify with common expression

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Ole
Ole 2021-4-5
编辑： Ole 2021-4-5
How to simplify further ?
How to try to pull comomon expression ?
syms c d x
assume(0 <=x & x <= pi/2 & d>0 & c <0)
f = (cos(x)^7*(2*c - 14*sin(x)^4 + 21*sin(x)^8 - 14*c^2*sin(x)^2 + 21*c^2*sin(x)^4 + c^2 - 14*c*sin(x)^2 - 14*c*sin(x)^4 + 42*c*sin(x)^6 + 1))/(16*d^5);
simplify(f,'Steps',1000) %does not simplify further

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