Question

(sec A+ tan A) (1 - sin A) = ?
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Answer 1

Answer:

COS A

Step-by-step explanation:

(SEC A + TAN A) (1-SIN A)

(1 / COS A + SIN A / COS A) (1-SIN A)

REASON: SEC A = 1 / COS A, TAN A = SIN A / COS A)

(1 + SIN A) (1 - SIN A) / COS A

1^2 - SIN^2 A / COS A

REASON: (a+b)(a-b) = a^2 - b^2

COS^2 A / COS A

REASON: SIN^2 A + COS^2 A = 1

COS^2 A = 1 - SIN^2

•°• COS A

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