Teaching EMRS TGT Mock Test 2023 Mathematics Trigonometry Trigonometric Identities

যদি sec x + tan x = 2 হয়, তাহলে cos x -এর মান নির্ণয় করুন।

1
\(1\over 3\)
2
\(3\over 4\)
3
\(1\over 2\)
4

\(4\over 5\)

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