cos(x-20)=tan 325

I have been trying to solve this equation but I find it so difficult to solve it and I don't know if is it mi who is dump or this quastion is so difficult.......please I realy need some help here
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kosine(x-20)=tan(325)... kosine(x-20)=-0.700207538... yu need tu get invers kosine av negativ number... me kalkulater gave rong anser, so me duit round-about... get inver kosine av +0.700207538=+45.55634282 deg... then invers av negativ number=180-45.556e4282 deg... =134.4436572 deg so x=20+134.4436572 deg... x=154.4436572
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