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{90 -(48 - 21)} -: 7...

`{90 -(48 - 21)} -: 7`

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7 xx {(-3)-(-6)} = 21 = 7 xx (-3) -7 xx (-6) = square-square=square=square=21 (Let's fill the blank squares.)

Let us multiply with the help of identity . (7 + 3x) (49 - 21x + 9x^2)

Using concept of opposite number, let's subtract. (ix) (-21) - (+21)

Simplify : ("sec"(270^@ - A) "sec"(90^@ - A) - tan (270^@ -A) tan (90^@ + A))/(cot A + tan (180^@ + A) + tan (90^@ + A) + tan (360^@ - A) + cos 180^@)

(i) 7/8 ÷ 21/5

Prove that the points P(-1,-2) Q (7,4) R (4,8) and S(-4,2) are the vertices of a rectangle.

Write the decimal form of the following rational numbers without actual division. (i) 35/50 (ii) 21/25 (iii) 7/8

Let's resolve into factor:- 7x^2 - 48xy - 7y^2