Jawaban:
a) 1 - cos²30 = sin² 30
1 - ( cos 30)² = ( sin 30)²
1 - ( ½√3)² = (½)²
1 - (¼ x 3) = ¼
1 - 3/4 = ¼.
4/4 - 3/4 = ¼
b) 1 - sin² 45 = cos² 45
1 - (½√2)² = ( ½√2)²
1 - ¼ x 2 = ¼ x 2
1 - ½ = ½
2/2 - ½ = ½
c) sin² 60 + cos² 60 = 1
(sin 60)² + ( cos 60)² = 1
( ½√3)² + ( ½)² = 1
¼ x 3 + ¼ = 1
¾ + ¼ = 1
d) -1 + sec² 30 = tan² 30
-1 + ( 1/cos 30)² = ( tan 30)²
-1 + ( 1/ ½√3)² = (⅓√3)²
-1 + ( 1 / ¼ x 3) = ⅑ x 3
-1 + ( 1/3/4 ) = 3/9
-1 + 3/4 = ⅓
-3/3 + 4/3 = ⅓
⅓ = ⅓
e) sec² 45 - tan² 45 = 1
( 1 / cos 45)² - ( Tan)² = 1
( 1/ ½√2)² - ( 1 )² = 1
( 1 / ¼ x 2) - 1 = 1
( 1/ 2/4 ) - 1 = 1
1 / ½ - 1 = 1
2/1 - 1 = 1
2 - 1 = 1
f) 1 + tan²60 = sec² 60
1 + ( Tan 60)² = ( sec 60)²
1 + ( √3)² = ( 1/ cos 60)²
1 + 3 = (1 / ½)²
4 = (2/1)²
4 = 4
g) cosec² 30 - cot²30 = 1
(cosec 30)² - (√3)² = 1
( 1/ sin 30)² - 3 = 1
( 1/ ½)² - 3 = 1
2² - 3 = 1
4 - 3 = 1
h) -1 + cosec² 45 = cot² 45
-1 + (1/sin 45)² = ( 1)²
-1 + ( 1/ √2/2)² = 1
-1 + (1/ 2/4) = 1
-1 + 4/2 = 1
-1 + 2 = 1
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Jawaban:
a) 1 - cos²30 = sin² 30
1 - ( cos 30)² = ( sin 30)²
1 - ( ½√3)² = (½)²
1 - (¼ x 3) = ¼
1 - 3/4 = ¼.
4/4 - 3/4 = ¼
b) 1 - sin² 45 = cos² 45
1 - (½√2)² = ( ½√2)²
1 - ¼ x 2 = ¼ x 2
1 - ½ = ½
2/2 - ½ = ½
c) sin² 60 + cos² 60 = 1
(sin 60)² + ( cos 60)² = 1
( ½√3)² + ( ½)² = 1
¼ x 3 + ¼ = 1
¾ + ¼ = 1
d) -1 + sec² 30 = tan² 30
-1 + ( 1/cos 30)² = ( tan 30)²
-1 + ( 1/ ½√3)² = (⅓√3)²
-1 + ( 1 / ¼ x 3) = ⅑ x 3
-1 + ( 1/3/4 ) = 3/9
-1 + 3/4 = ⅓
-3/3 + 4/3 = ⅓
⅓ = ⅓
e) sec² 45 - tan² 45 = 1
( 1 / cos 45)² - ( Tan)² = 1
( 1/ ½√2)² - ( 1 )² = 1
( 1 / ¼ x 2) - 1 = 1
( 1/ 2/4 ) - 1 = 1
1 / ½ - 1 = 1
2/1 - 1 = 1
2 - 1 = 1
f) 1 + tan²60 = sec² 60
1 + ( Tan 60)² = ( sec 60)²
1 + ( √3)² = ( 1/ cos 60)²
1 + 3 = (1 / ½)²
4 = (2/1)²
4 = 4
g) cosec² 30 - cot²30 = 1
(cosec 30)² - (√3)² = 1
( 1/ sin 30)² - 3 = 1
( 1/ ½)² - 3 = 1
2² - 3 = 1
4 - 3 = 1
h) -1 + cosec² 45 = cot² 45
-1 + (1/sin 45)² = ( 1)²
-1 + ( 1/ √2/2)² = 1
-1 + (1/ 2/4) = 1
-1 + 4/2 = 1
-1 + 2 = 1