cos 90° ka value kya hota hai
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cos 90°value is 0
if it is wright thank for my answer
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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
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