Question

cos 90° ka value kya hota hai​

Answer 1

cos 90°value is 0

if it is wright thank for my answer

Answer 2

cos90= cos(45+45)

cos45×cos45-sin45×sin45{ using formula cos(A+B)}

= 1/√2×1/√2-1/✓2×1/√2

=1/2-1/2

=0