Teaching Haryana (HPSC) PGT Mock Test 2024 Mathematics Trigonometry Multiple and Sub-multiple Angles

cos 18° - sin 18° का मूल्य क्या है? 

1
√2 sin27° 
2
\(\rm 1 \over \sqrt 2\)sin27° 
3
√2 cos27° 
4
​\(\rm 1 \over \sqrt 2\)cos27° 
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