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If cos (α + β) = 0, then value of cos((α + β)/2) is equal to :
Evaluate : 2√2 cos 45° sin 30° + 2√3 cos 30°
If A = 60° and B = 30°, verify that : sin (A + B) = sin A cos B + cos A sin B
An observer 1.8 m tall stands away from a chimney at a distance of 38.2 m along the ground. The angle of elevation of top of chimney from the eyes of observer is 45°. The height of chimney above the ground is
Assertion (A) : For an acute angle θ, value of cosec θ cannot be 1/√2. Reason (R) : cosec θ ≥ 1 for 0° ≤ θ ≤ 90°
It is given that sin (A − B) = sin A cos B − cos A sin B. Use it to find the value of sin 15°.
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