- How to work out 1/sec(60) and 3cot(30)/2cosec(30)?

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1+tan²x×(sin²-1)
Can someone help? Si dos paracaidistas se lanzan uno despues de otro sin tener en cuenta la resistencia del aire su distancia vertical disminuye? Find the energy of the photon required to excite a hydrogen atom from the n=1 state to the n=5 state.? How is 2 to the power of x translated if I change it to 2 to the power of x+3? Hshdbznjsjsnbxbx?