Question

If secA+tanA=a then find the value of tanA

Answer 1

Step-by-step explanation:

Sec²A-tan²A=1 (it is an identity)

(SecA-tanA)(SecA+tanA)=1

(SecA-tanA)a=1

SecA-tanA=1/a

SecA+tanA=a (given)

From the above two equations we can solve to get the value of tanA

tanA=a²-1/2a

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