Advertisements
Advertisements
प्रश्न
If A = 450, verify that :
(i) sin 2A = 2 sin A cos A
उत्तर
A= 450
`⇒ 2A = 2xx45^0=90^0`
(i) sin 2A = sin `90^0=1`
2 sin A cos A = 2 sin `45^0 cos 45 ^0 = 2 xx1/sqrt(2) xx 1/sqrt(2) = 1`
∴ sin 2A = 2 sin A cos A
APPEARS IN
संबंधित प्रश्न
If 3cos θ – 4sin = 2cos θ + sin θ Find tan θ.
If tan θ = `20/21` show that `((1-sin θ + cos θ))/((1+ sin θ +cos θ)) = 3/7`
If ∠A and ∠B are acute angles such that tan A= Tan B then prove that ∠A = ∠B
Evaluate:
cos600 cos300− sin600 sin300
Evaluate:
`(sin^2 30^0 + 4 cot^2 45^0-sec^2 60^0)(cosec^2 45^0 sec^2 30^0)`
Verify each of the following:
(iv) `2 sin 45^0 cos 45^0`
If A = 600 and B = 300, verify that:
(i) sin (A – B) = sin A cos B – cos A sin B
From the given figure, find the values of sec B
From the given figure, find the values of cos C
A boy standing at a point O finds his kite flying at a point P with distance OP = 25 m. It is at a height of 5 m from the ground. When the thread is extended by 10 m from P, it reaches a point Q. What will be the height QN of the kite from the ground? (use trigonometric ratios)
