If sina+cosa=7/5then find the value of sina-cosa=?
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sina +cosa=7/5
squaring both sides
sin^2a +cos^2a +2cosasina=49/25
1 +2sinacosa=49/25
2sinacosa=24/25
sin^2a +cos^2a -2sinacosa=1-24/25=1/25
(sina- cosa)^2=1/25
taking square root on both sides
sina-cosa=1/5
squaring both sides
sin^2a +cos^2a +2cosasina=49/25
1 +2sinacosa=49/25
2sinacosa=24/25
sin^2a +cos^2a -2sinacosa=1-24/25=1/25
(sina- cosa)^2=1/25
taking square root on both sides
sina-cosa=1/5
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