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Now, write tan(45-α) and by the property of tanα it will be equal to nad this will be equal to

so the value of that tanα term that you have given in the question will be tan(45-α)

Now,put the value of α that we have got above

so the answer will be

Sec alpha =5/4

cos alpha=4/5

sin alpha=3/5

1-tanalpha/1+tanalpha=1-3/4

-------=1/7

1+3/4

cos alpha=4/5

sin alpha=3/5

1-tanalpha/1+tanalpha=1-3/4

-------=1/7

1+3/4