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Let (1 + x + x2 + … + x2n) (1 – x + x2 – x3 + … + x2n) = a0 + a1 + a2 + a3+ …… Put x = 1 => 2n + 1 = a0 + a1 + a2 + a3 + …… …(i) Put x = -1 => 2n + 1 = a0 – a1 + a2 – a3 + …… …..(ii) Add (i) and (ii), we get 2n + 1 = 89 Or n = 44
Find the value of sin265o + sin225o + cos235o + cos255o.
...If sin θ + cos θ = 1.2, find the value of sin θ. cos θ.
What is the value of cos75°?
What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2]?
Simplify the following trigonometric expression:
12 cos 68o cosec 22o - 3 cot 72o cot 18o
A person is standing at a point 120 meters away from a tower. The angle of elevation to the top of the tower is 60°. If the height of the tower increas...
If sin3A = cos(5A-30°), then what is the value of A? Given that 3A is an acute angle.
If sinAo = (√3/2), then find the value of (sin245o + cos230o) × A ÷ 5 given that 0 < A < 90...