Question

trigonometry of complementary angles ,both​

Answer 1

Answer:

cos 20= sin70

therefore cos20 ^2 = sin 70^2

therefore

sin70 ^2 + cos 70 ^2

=1

Step-by-step explanation:

Answer 2

answer is zero

suppose angles be thita

cos thita = m and cos thita = n

cos sqr thita = 1 - sin sqr thita

cos sqr thita + sin sqr thita = 1

sum of sin and cos sqr = 1

i.e

1 = 1 or zero