Question

2cos=
how to make this sum​

Answer 1

Answer:

there is no standard formula for this.you can derive it as follows (math) 1+cosx=2cos square ( x/2) (math) therefore 2cos + 2cos = 4cos square

Answer 2

Answer :-

according to trigonometric identtities

cos x = 1 / sec x

so,

2(cos x ) = 2( 1 / sec x )

2cos x = 2 / sec x

cos x = 1 / sec x

2cos = 2 / sec

Hope this ans is help you.