" If "3sin beta+5cos beta=5," then "3cos beta-5sin beta" is equal to "

Given 3sin beta+5cos beta=5, then the value of (3cos beta-5sin beta)^(2) is

If cos alpha + cos beta =0 = sin alpha + sin beta , then cos 2 alpha + cos 2 beta is equal to

If cos alpha+cos beta=0=sin alpha+sin beta, then cos2 alpha+cos2 beta is equal to

If cos alpha+cos beta=0=sin alpha+sin beta, then cos2 alpha+cos2 beta is equal to (a)-2sin(alpha+beta)(b)-2cos(alpha+beta)(c)2sin(alpha+beta)(d)2cos(alpha+beta)

If cos alpha+cos beta=0=sin alpha+sin beta , then cos 2 alpha+cos 2beta is equal to

If sin beta + cos beta=(5)/(4) , then find the value of sin beta * cos beta .

If 4tan beta=3, then (4sin beta-3cos beta)/(4sin beta+3cos beta)=

Evaluate: quad =|cos alpha cos beta cos alpha sin beta-sin alpha-sin beta cos beta0sin alpha cos beta sin alpha sin beta cos alpha|