Question
Which of the following is true when x = SinA + CosA and
y = SecA + CosecA?Solution
x = SinA + CosA       … (1) y = SecA + CosecA =1/cosA +1/sinA =(sinA+CosA)/SinA.CosA y = x/SinA.CosA       … (2) EQ (1) both sides squaring… x2=1+2sinA.CosA SinA.CosA =(x2-1)/2 Put the value in EQ (2). y =2x /(x2-1) yx2-y =2x y+2x =x2y.
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
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