Question
Simplify the following expression:Â (8x - 6y - 5z)Â
2Solution
Using (a + b + c)Â 2Â = a2Â + b2Â + c2Â + 2ab + 2bc + 2ac So, (8x - 6y - 5z)Â 2Â = (8x)Â 2Â + ( - 6y)Â 2Â + ( - 5z)Â 2Â + 2(8x) ( - 6y) + 2( - 6y) ( - 5z) + 2(8x) ( - 5z) = 64x2Â + 36y2Â + 25z2Â - 96xy + 60yz - 80zx
- Calculate the value of sin120 o  + cos180 o  + tan225 o .
- If sin 2a = (7/9), then find the value of (sin a + cos a).
If sec A + tan A = 3 then the value of cot A is:
If cosx/siny = n and cosx/cosy = m, then the value of cos 2 y is:
1. m 2 /(m 2 Â + n 2 )
2. 1/(m ...The value of sec2 45˚ + 2 tan 135˚ is –
Find the value of the given trigonometric expression:
(sin 22°cos 68° + cos²22°) × sin 30° + (cos 60°tan 45°) × sec 60°
...
sin2 17˚ + sin2 19˚ + sin2 21˚ + sin2 23˚ + ……… + sin2 77˚ = ?
If tan θ + cot θ = 2 where 0 < θ < 90 ; find the value of tan30 θ + cot 29 θ.
If sec 4A = cosec (3A - 50°), where 4A and 3A are acute angles, find the value of A + 75.
