Question

if cos a = 3/5 then find 9 cot ^2 - 1​

Answer 1

Step-by-step explanation:

If cosA=3/5

then sinA=4/5( Using Pythagoras Theorem)

9cot^2A-1=9*cos square A/sin square A-1

=9*9/25/16/25 - 1

=81/16-1

=65/16

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