Question
If sin A - cos A = 3/7, then find value of sinA + cos
B, where A is an acute angle.Solution
We Know that, (a+b)2 + (a-b)2 = 2(a2 + b2) Hence, (sin A + cos A)2 + 
= 2(sin2 A + cos2 A) => (sin A + cos A)2 + = 2(1) => (sin A + cos A)2 = 2 - => (sin A + cos A)2 = 2 - = = => (sin A + cos A) =
Select the correct combination of mathematical signs that can sequentially replace the “@” sign and balance the following equation.
12@5@7@2@...
If '+' means ' - ', ' X ' means '+', ' - ' means '÷' and '÷' means ' X ', then what is the value of the following expression?
112 - 4 + 65 X 22...
If ‘P’ means ‘+’, V means ‘×’, T means ‘-‘ and ‘Q’ means “÷’ , then find the value of the expression given below:
30 P ...
If ‘+’ means ‘-’, ‘×’ means ‘+’, ‘-’ means ‘÷’ and ‘÷’ means ‘×’, then what is the value of the following expression...
Select the correct combination of mathematical signs that can sequentially replace '*' sign and balance the equation given below.
432 * 6 * 9 * 1...
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32 ÷ 5 X 184 - 8 + 78 If 'A' means ' X ', 'B' means '÷', 'C' means '+' and 'D' means ' - ', then what will come in the place of '?' in the given expression?
200 B 8 C...
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
48 * 14 * 7 * 11 * 4 = 89
If x stands for ‘addition’, ÷ stands for ‘subtraction’, + stands for ‘multiplication’, and – stands for ‘division’, then 30 x 40 – ...
What will be the value of expression if the numbers/digits ‘(42)’ and ‘(18)’ are interchanged?
54 ÷ 42 × 10 + 18 – 12 + 20
...
