If θ is an acute angle and sinθ=p−68−p, then p must satisfy
If θ is an acute angle such that tan2 θ=87, then the value of (1+sin θ)(1−sin θ)(1+cos θ)(1−cos θ) is
A. 74
B. 78
C. 87
D. 6449
If p cotθ = √q2−p2, then the value of sinθ is ___. (θ being an acute angle).