B3 =(LOG(TAN(RADIANS(A3/2+45))))*7915.704468-(23.0133633*(SIN(RADIANS(A3))))-0.051353*(SIN(RADIANS(A3))^3)-0.000206*(SIN(RADIANS(A3)))^5

So will be B3 = 3665.0338

I wish to reverse the formula by writing on C3 = 3665.0338 and on D3 the answer will be 52.1847833333333

Can anybody please help me.