Derive cos (x +9) COS X (ory
sina sing
2
B.T. Cas Crayd=cose cosyt
sina asing
4 P.T Jancety ja Janat
Ja Jany
Jang
9- Jahr
4 Р. Т
sin ax = 2 Sina Cosx =
2 Jane
14 Jan²t
2
T
cos 22
cast &-sin²x
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