Question

Triangle TRY is a right angled isosceles triangle then find the value of

cosT + cosR + cosY​

Answer 1

Answer:

√2

Step-by-step explanation:

Note:

• cos 90° = 0
• cos 45° = √2/2

Since given is right isosceles triangle angles will be 90° , 45° and 45°

Hence ,

cos 90° + cos 45° + cos 45°

=>0 + 2cos 45°

=>0 + 2(√2/2)

=>√2 or 1.4142