Answers edited by Swarna Islam

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Question #efef9
Question #70f00
Prove that tan(A+B)*tan(A-B)=cos²B-cos²A/cos²B-sin²A?
Question #786a6
Question #703cc
Question #2144a
Question #e7dd8
If tanA+sinA=p and tanA-sinA=q. Then proove that $p^{2} - q^{2} = 4 \sqrt{p q}$ $p^2-q^2=4sqrt (pq)$ ?
Prove $\frac{{tan}^{- 1} (cot (θ))}{2} = \frac{π}{4} + \frac{θ}{2}$ $tan^-1 (cot (theta)) /2 = pi/4 + theta/2$ ?
Question #74225
Can someone verify this? (cotx-1)/(cotx+1) = (1-sin2x)/(cos2x)
A projectile is shot from the ground at a velocity of $15 \frac{m}{s}$ $15 m/s$ at an angle of $\frac{π}{6}$ $pi/6$ . How long will it take for the projectile to land?
How do you solve the following system?: $9 x + 12 y = 7, - 2 x - 21 y = - 41$ $9x +12y = 7 , -2x - 21y = -41$
How do you find the domain and range of $f (x) = - 4 + \sqrt{x + 3}$ $f(x)=-4+sqrt(x+3)$ ?
How do you determine $tan θ$ $tantheta$ given $cos θ = \frac{1}{8}, \frac{3 π}{2} < θ < 2 π$ $costheta=1/8, (3pi)/2<theta<2pi$ ?
Question #6b51b
Question #b18b1