Prove the following formula for the computation of the future v...

Prove that C(n+1,r) = C(n,r)+ C(n,r-1) ~~~~~ I know the defintion of a combination is... C= n!...

Prove: 3/ a(2a^2 + 7)

Now we prove Machin's formula using the tangent addition formula: tan(A+B)= tanA+tanB/1-tanAtanB....

Prove that 20^22 - 17^22 + 4^33 - 1 is divisible by 174.

If A + B + C = 180° prove that Sin2A + sin2B – sin2C = 4cosAcosBsinC

If A + B + C = 180° prove that cos2A + cos2B – cos2C = -1 -4cosAcosBcosC

can we prove the formula to find the area of an octagon

Prove without using a formula,that the sum of the series 3^2+3^4+3^6+......to 20 terms is given by...

Prove ((sec^2(x))(sec^2(x)+1)/sin^2(x) +csc^4(x)-tan^2(x)*cos^2(x) = (sec^4(x))/sin^2(x) + sec^2(x)*...

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