Question

If the value of expression sin25 sin 35 sin85 can be

Answer 1

The answer of question is √3+1/8√2...

Answer 2

Answer:

Step-by-step explanation:

The given expression is:

sin25 sin35 sin85=$\frac{1}{2}(2sin85sin35)sin25$

=$\frac{1}{2}(cos50-cos120)sin25$

=$\frac{1}{4}(2cos50sin25+2cos60sin25)$

=$\frac{1}{4}(2cos50sin25+2(\frac{1}{2}) sin25)$

=$\frac{1}{4}(2cos50sin25+sin25)$

=$\frac{1}{4}(sin75-sin25+sin25)$

=$\frac{1}{4}(sin75)$

Thus, the value of the given expression is =$\frac{1}{4}(sin75)$