Question

prove it by identities​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

(1+ tan^2)(1-sino)(1+sino)=1

by trigonometry identities

(1+ tan^2 = sec^2 )

so

(sec^2)(1-sin^2)

we know

sec^2 = 1/cos^2 & (1-sin^2= cos^2)

so (1/cos^2)(cos^2)=1