Tolong bantu dengan cara penyelesaiannya

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Tolong bantu dengan cara penyelesaiannya

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TRIGONOMETRI II

a + b + 90° = 180°

a + b = 90°

b = 90° -a

sin a + cos b = ½

sin a + cos (90° -a) = ½

sin a + sin a = ½

2 sin a = ½

sin a = ¼ = a/c

cos²a = 1 -sin²a

cos²a = 1 -1/16 = 15/16

cos a = ¼√15

tan a = sin a/cos a

tan a = 1/15 √15

csc b = 1/sin

= 1/cos a

= 4/15 √15

tan a -csc

= 1/15 √15 -4/15 √15

= 3/15 √15

= ⅕√15


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