secA + tanA =52 হলে secA - tanA =? - Prothom Sir

secA + tanA = \frac{5}{2}

হলে secA - tanA =?

Created: 5 months ago | Updated: 2 days ago

\frac{1}{2}

\frac{1}{5}

\frac{2}{5}

\frac{5}{2}

1549

Best Description

1 + tan² A = sec² A

Then...

sec² A - tan² A = 1

=> ( sec A - tan A ) ( sec A + tan A ) = 1

=> ( sec A - tan A ) × 5/2 = 1

=> sec A - tan A = 2/5

1 year ago

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