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It is given that sin (A − B) = sin A cos B − cos A sin B. Use it to find the value of sin 15°.
If sin A = y, then express cos A and tan A in terms of y.
If tan θ + sin θ = m and tan θ − sin θ = n, then prove that m² − n² = 4√mn.
Prove that : (cot A − 1)/(2 − sec² A) = cot A/(1 + tan A)
If sec A = 25/7, then find the value of cosec A and tan A.
Evaluate : 2 sin 30°tan60° − 3 cos² 60 °sec²30°
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