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The value of cos1° cos2° cos3° ............. cos177° cos178° cos179° is?
A
0
B
$$\frac{1}{2}$$
C
1
D
$$\frac{1}{{\sqrt 2 }}$$
Correct Answer:
0
cos1° cos2° cos3° ............. cos177° cos178° cos179°
= cos90°
= 0
= 0
cos2(60°+A) +cos2(60°-A) এর মান -
A
1-12cos2A
B
1+ sin2A
C
1 +3 cos2A
D
1 + 12cos2A
যদি A+B=π2 হয়, তবে cos2 A-cos2 B এর মান কত?
A
sinA-B
B
sin B-A
C
cos B-A
D
-cos B-A
A+B=π2হলে, cos2 A – cos2 B এর মান-
A
sin (A – B)
B
sin (B – A)
C
cos (B – A)
D
– cos (A – B)
cos3(cos-1cot-13z) কত?
A
18
B
338
C
38
D
338
Find nth derivative of y = Sin(x) Cos3(x)
A
(1/4) 2nSin(2x+nπ/2) + (1/8) 4nSin(4x+nπ/2)
B
(1/4) 2nCos(2x+nπ/2) + (1/8) 4nSin(4x+nπ/2)
C
(1/4) 2nSin(2x+nπ/2) + (1/8) 4nCos(4x+nπ/2)
D
(1/4) 2nCos(2x+nπ/2) + (1/8) 4nCos(4x+nπ/2)
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the ____________
A
blades are equiangular
B
blade velocity coefficient is unity
C
blade solidity is 0.65
D
blades are equiangular and frictionless
If $$\tan \theta = \frac{3}{4}{\text{,}}$$ find the value of $${\text{cos2}}\theta $$ ?
A
$$\frac{{24}}{{25}}$$
B
$$\frac{{16}}{{25}}$$
C
$$\frac{7}{{25}}$$
D
$$\frac{9}{{30}}$$
sin2∅+cos2∅=?
A
-1
B
1
C
2
D
-2
∫cos2 xdx-∫ sin2 xdx এর মান কোনটি?
A
2sin2x + c
B
-2sin2x + c
C
12sin2x + c
D
12cos2x + c
cos2(sin-113 এর মান কত?
A
32
B
43
C
23