Math, asked by sundra5607, 6 months ago

2
Find Cos 2A, if A lies in the
first quadrant, and sinA=2/5

Answers

Answered by shaniyanajeem

1

Step-by-step explanation:

sin A = 2/5

Cos 2A = 1 - 2sin ^2 A ~Formula of cos (2 theta)

= 1- 2× (4/25)

= 1 - 8 /25

=17/25

Hope you understood the solution

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