sin105+cos105=cos45 plz prove easy way for me
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sin(90+15) + cos(90+15)
cos 15 - sin 15
cos(45-30)= cos 45 cos 30 + sin45 sin30
= √3/2√2 + 1/2√2
√3+1)/2√2
sin( 45-30)= sin45 cos30- cos45 sin30
= √3/2√2 - 1/2√2
add
2/2√2
1/√2
RHS
COS 45= 1/√2
cos 15 - sin 15
cos(45-30)= cos 45 cos 30 + sin45 sin30
= √3/2√2 + 1/2√2
√3+1)/2√2
sin( 45-30)= sin45 cos30- cos45 sin30
= √3/2√2 - 1/2√2
add
2/2√2
1/√2
RHS
COS 45= 1/√2
ritesh2556:
thanks .....bro
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