If θ is an acute angle such that sec2θ=3. then the value of tan2θ−cosec2θtan2θ−cosec2θ is
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