cos square 45 degree minus sin square 15 degrees
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cos 45 = 1/ sin 45 = 1/ sin 30 = 1/2
sin 15 = sin45-sin30
=1/ -1/2 = 2-tex] \sqrt{2} [/tex]/2tex] \sqrt{2} [/tex]
cos45-sin15 = 2 -tex] \sqrt{2} [/tex]/2tex] \sqrt{2} [/tex]-1/1/
= /2/
sin 15 = sin45-sin30
=1/ -1/2 = 2-tex] \sqrt{2} [/tex]/2tex] \sqrt{2} [/tex]
cos45-sin15 = 2 -tex] \sqrt{2} [/tex]/2tex] \sqrt{2} [/tex]-1/1/
= /2/
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