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The value of cos² x + cos² y – 2cos x × cos y × cos (x + y) is

The value of cos² x + cos² y – 2cos x × cos y × cos (x + y) is A sin (x + y) B sin² (x …
Math

If a×cos x + b × cos x = c, then the value of (a × sin x – b²cos x)² is

If a×cos x + b × cos x = c, then the value of (a × sin x – b²cos x)² is A a² + b² + c² B …
Math

If cos a + 2cos b + cos c = 2 then a, b, c are in

If cos a + 2cos b + cos c = 2 then a, b, c are in A 2b = a + c B b² = a × c …
Math

The value of cos 5π is

The value of cos 5π is A 0 B 1 C -1 …
Math

In a triangle ABC, cosec A (sin B cos C + cos B sin C) equals

In a triangle ABC, cosec A (sin B cos C + cos B sin C) equals A 1 B c/a …
Math

If the angles of a triangle be in the ratio 1 : 4 : 5, then the ratio of the greatest side to the smallest side is

If the angles of a triangle be in the ratio 1 : 4 : 5, then the ratio of the greatest side to the smallest side is A …
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